the big problem with getting someone up there to work on Cena's level reaction wise, is that it can't be manufactured. Takwe Ziggler, great on the mic great in the ring ( not a real fan personally but hey i won't deny the talent) however he doesn't ahve the kind of charisma that cena does, with all the reaction he gets it's not as passionate from the fans. The WWE has always had a small group at the top but with HHH being more corporate, Michaels retiring, Taker on a very light schedule, we have Cena right now and that's it. will he last until someone can garner the passion from the crowd he does... who knows maybe. you can't build someone with cena's reaction ( or McEntyre would be there by now), it has to come from them, and not many have been able to do it. Hogan, Michaels,Taker, Rock, Austin, Edge, HHH, and Cena off the top of my head. Angle to a degree but even he wasn't quite that big.