Yes, I think it would. The Duskblade doesn't lose any BAB while waiting for its 8 ranks in Knowledge(Arcana), which is a class skill. Also, at 5th level the Duskblade gets its 2nd-level spells, some of which are nice. My favorites: Blade of Blood (+1d6 damage for 1rd/lvl, or +3d6 if caster takes 5 points damage), Ghoul Touch, and Swift Invisibility. After picking up a 2nd-level spell or two, you can jump right into Dragon Disciple. If the specific 2nd-level spells aren't your cup of tea, then use Arcane Strike to get the best use out of your extra slots.
But remember! The Duskblade's crowning feature is the Arcane Channeling at 13th level. If you're not looking for wings and extra intelligence, stop Dragon Disciple at 7th level and go back to Duskblade (or mix it up a bit, ending up with only 7 DD levels). Having BAB +18/+13/+8/+3 and the ability to use a single spell slot and a swift action for enhancing all four attacks is... excellent. Of course, you can skip the iteratives and go for the Bite/Claw/Claw that Dragon Disciple offers. At that point, the 13th level Duskblade ability wouldn't even work, so there's little point to advancing that far for martial ability.