You're the first person I see reach that conclusion and seeing how Cena handled walking away from the spotlight with a grace we would be hard pressed to see from older superstars, from using the US TItle to put over the likes of Sami Zayn and Cesaro, passing the torch as "the guy" to Roman (growing pains notwithstanding) to finally taking the Wrestlemania "L" against the Fiend (independent from the fact his work putting Wyatt over was then thrown into the trash immediately afterwards) I'm inclined to agree with what you say.I'm going to give Cena the benefit of the doubt on this one. Cena's concept was if they ALL have barnstormers and give Cena a run for his money, they'd all be viable threats.
Remember that road agents make the matches backstage, and Vince, seeing the next Hulk Hogan, wanted an unstoppable money machine.
A lot of people seemed to conflate Cena's status as his era's Hogan with thinking he had Hogan's ego and attitude about getting himself over "cause they just ain't ready, brother", where the easier and more likely scenario was that Vince, lunatic that he is, would never put guy that are "rookies" anywhere near Cena's actual level, not even for the sake that he could have built at the least (not counting Tarver who got himself fired and Otunga who transitioned away from the ring) six main eventers. (Even if Heath and D-Young eventually would be in tag teams and not singles, but who knows if The Nexus angle had gone like Cena hoped, their careers would have changed accordingly as well.)
ETA: Yeah, his putting over of Cesaro and Sami didn't stick for long either. Again, that's on the room full of monkeys on typewriters and Vince that fail to capitalize on them.