Really? Well here's my input; the blues haven't had a good idea since LFR.
The fact of the matter is that 25 mans are unattractive for the same reason that 40 mans were unattractive. No difference in content, no extra reward, but a lot of additional hassle. There is no way to incentivize 25 mans without disadvantaging 10 mans. Ergo, the solution becomes to simply introduce a uniform raid size. No fuss, no muss.