Racial paragon paths would be nice, but it would have to be as opposed to standard paragon paths.
One of the reasons they might not have made them was because many different classes cue on many different abilities, which means a racial class will almost never be optimal.
However, i do not like the answer that was given about doing one racial path for each "type" and so would put them into the following form for the following reasons.
1. All powers cue off of one of the racial bonus stats. This is because players are likely to make one of their racial bonus stats their secondary stats(I.E. dwarf wizards are likely to be orb or staff and pump con or wis)
2. There are no stat increases. Stat increases simply move optimal racial choices
from "good" to "best". How could anyone run a str based ranger/fighter/etc with anything other than a dragonborn if they got another +2 strength and powers that conformed to their class
3. Each racial paragon needs to have one option per combat type. So you would have "Paragon Dwarven Defender", "Paragon Dwarven Leader", "Paragon Dwarven Controller", "Paragon Dwarven Striker". Which would have a focus on abilities that fit the racial characteristics. I.E. Expanding and fulfilling racial characteristics. E.G. a Paragon Dwarven Defender might get a bonus to fort defense and immunity to poison based attacks. A Paragon Dwarven Leader might transfer the Dwarven forced movement reduction to all friendlies. A Paragon Dwarven Controller would focus on walls/knockbacks. A Paragon Dragonborn Striker would get powers that made his breath weapon awesome, A paragon Elf Leader would get lots of friendly movement powers and increase the base speed of his group by 1, etc etc etc.
4. You need to have taken at least one or possibly two racial feats in order to qualify for the class(Similar to multi-class paragon)
5. There are no paragon human options. With a floating bonus this makes it too easy to conform to any class. (I am iffy on this)
6. Half-Elf can take Elf or Half-Elf Paragons.(or human if i scrap rule 5)
That would be my base rules and now that i look at it i really want to hash it out and see how it turns out.