I have been thinking the same thing. The WWE has three brands and superstars. and yet they all are being marketed at the same audience.
Personally I think it would be great to move Cena to Smackdown and make it be their PG show. They already have Mysterio there and with its earlier timeslot and being on the weekend more kids could watch it. The only downside to that is I actually enjoy the wrestling focused Smackdown we have now. I don't want it cluttered with Cena & Batista promos, Undertaker taking souls and Santino, Chavo, Hornswoggle segments.
The only way I would be all for it is if they did a complete overhaul of all three brands at the draft and make ECW more than a developmental ground. (not the old ECW it's long gone but a wrestling focused show as Smackdown is now)
Raw - Flagship Show Attitude style - HHH, Edge, HBK, Legacy, Orton, Kane
Smackdown - PG show - Cena, Batista, Mysterio, Hormswoggle, Santino, Goldust, Taker
ECW - Wrestling based - Jericho, Morrison, Hardy's Christian, Swagger, Kofi, Benjamin
It would give us three completely different styles and could bring back some fans that left because of the one dimensional thinking that creative has