I have a L-20 sorcerer in my epic campaign who is taking this PrC beginning at L-21. He basically feels that there is no point in advancing sor in epic levels, so why not?
As an aside, you must be able to cast arcane spells spontaneously to take this PrC (i.e., Bard or Sorcerer). But gnomes can cast three arcane spells (each once per day). They don't need to be prepared... hence spontaneous? >

Make a gnome fighter or barbarian and just move into this PrC for some ability increases.
P.S. Here's an epic-advancement of this PrC that I sent to another mailing list. Enjoy...
Dragon Disciple (epic level progression)
The dragon disciple has awakened the dragon within, and his continued pursuit of arcane magic allows him to continue his transformation towards greater draconic power. The epic dragon disciple has completed his transformation into a half-dragon, complete with the power inherent in his magical blood, but his apotheosis is just the first step in his quest for power and self-mastery. Through his studies of arcane magic, the epic dragon
disciple refines and enhances his gifts, unlocking greater mysteries and developing powers that may even surpass his draconic heritage.
Epic dragon disciples favor feats that enhance their already considerable abilities, such as Armor Skin, Damage Reduction, Improved Spell Resistance, Great Charisma, and Great Strength. Many epic dragon disciples continue their studies of arcane magic, and improve their repertoire of spells with Improved Spell Capacity, Epic Spell Casting or Spell Knowledge.
Hit Die: d12 (this includes the hit die increase gained when the character underwent dragon apotheosis and became a half-dragon)
Skill Points: 2 + Int modifier
Spells: The epic dragon disciple continues to gain bonus spells at 11th, 12th, 14th, 15th, 16th, 18th, and 19th levels, as well as every level that is ten levels higher than these. (i.e., he does not gain a bonus spell at levels 13, 17, 20, 23, 27, 30, etc...). These bonus spells are gained just as bonus spells from high ability scores (i.e., they increase spells per day, not the number of spells known) and can be added to any spell level that the epic dragon disciple can cast when gained. If a character has more than one spellcasting class, he must decide which class benefits from the
bonus spell. Once a bonus spell has been applied, it cannot be shifted.
Natural Armor Boost: At 11th level, and at every three levels thereafter, the epic dragon disciple's natural armor increases by one point.
Bonus feat: At 12th level, and at every three levels thereafter, the epic dragon disciple gains a bonus feat selected from the dragon disciple bonus feat list.
Dragon Disciple bonus feat list: Additional Breath Weapon Use*, Armor Skin, Breath Weapon Admixture*, Breath Weapon Substitution*, Damage Reduction, Enhanced Breath Weapon*, Energy Resistance, Epic Spell Focus, Epic Spell Penetration, Epic Spellcasting, Epic Toughness, Expanded Breath Weapon*,
Extended Lifespan, Great Charisma, Great Constitution, Great Intelligence, Great Strength, Ignore Material Components, Improved Breath Weapon*, Improved Darkvision, Improved Low-Light Vision, Improved Spell Capacity, Improved Spell Resistance, Intensify Spell, Multispell, Permanent Emanation, Polyglot, Spell Knowledge, Spell Opportunity, Spell Stowaway, Spontaneous
Spell, Tenacious Magic.
*Denotes new feat described below.
11. 1 bonus spell, natural armor boost
12. 1 bonus spell
13. Bonus feat
14. 1 bonus spell, natural armor boost
15. 1 bonus spell
16. 1 bonus spell, Bonus feat
17. natural armor boost
18. 1 bonus spell
19. 1 bonus spell, Bonus feat
20. natural armor boost
Additional Breath Weapon Use [Epic]
You may use your breath weapon more often than normal.
Prerequisites: Con 25, natural breath weapon.
Benefit: You may use your breath weapon one additional time each day.
Special: This feat may be taken multiple times. Its effects stack.
Breath Weapon Admixture [Metamagic] [Epic]
You can modify your breath weapon to mix in an equal amount of another type of energy.
Prerequisites: Breath Weapon Substitution, Energy Admixture, Energy Substitution, one other metamagic feat, 25 ranks in Knowledge (arcana), natural breath weapon.
Benefit: Choose one type of energy: acid, cold, electricity, fire, or sonic. You can modify your breath weapon to add an equal amount of the chosen type of energy. The altered breath weapon works normally in all respects except the type of damage dealt (see Tome and Blood, p. 39, for more details). When you choose to modify your breath weapon using this feat, it uses two uses of
your daily allotment of breath weapon attacks. (Thus, if you can only use your breath weapon once per day, you cannot use this feat.) Also, using your modified breath weapon in this way is a full-round action.
Special: This feat may be taken multiple times, choosing a different energy type each time. You can use this feat multiple times on a single breath weapon, adding an additional use of your daily allotment each time.
Breath Weapon Substitution [Metamagic] [Epic]
You can modify your breath weapon to use a different type of energy.
Prerequisites: Energy Substitution, one other metamagic feat, 25 ranks in Knowledge (arcana), natural breath weapon.
Benefit: Choose one type of energy: acid, cold, electricity, fire, or sonic. You can modify your breath weapon to use the chosen type of energy instead of its regular type. The altered breath weapon works normally in all respects except the type of damage dealt (see Tome and Blood, p. 39, for more details). When you choose to modify your breath weapon using this feat is a full-round action.
Special: This feat may be taken multiple times, choosing a different energy type each time.
Enhanced Breath Weapon [Epic]
The damage from your breath weapon is more difficult to evade.
Prerequisites: Con 25, natural breath weapon.
Benefit: The DC for any saving throw related to your breath weapon is increased by 2.
Special: This feat may be taken multiple times. Its effects stack.
Expanded Breath Weapon [Epic]
The area covered by your breath weapon is greater than normal.
Prerequisites: Con 25, natural breath weapon.
Benefit: The area of your breath weapon doubles. For example, a 60-ft line is doubled to 120 feet, and a 30-ft cone becomes a 60-ft cone.
Special: This feat may be taken multiple times. Its effects stack. Remember that two doublings is a tripling, etc...
Improved Breath Weapon [Epic]
The damage from your breath weapon is more powerful than normal.
Prerequisites: Con 25, natural breath weapon.
Benefit: Your breath weapon deals an additional 2 dice of damage. Thus, if your breath weapon normally deals 6d4 damage, it now deals 8d4.
Special: This feat may be taken multiple times. Its effects stack.
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Ozmar the Dragon-Wrangler