If the WWE puts the belt on Cena then it had better be for a very short period, with him losing it at WM or soon after. There is absolutely no need to have Cena as champion except to be chased and caught by someone else. Another Cena title-run when Smackdown is building so much momentum as something new and different from RAW doesn't seem very smart long-term.
On a purely personal level, Cena's egotistical, hypocritical, and revisionist promo last Tuesday reminded me exactly why I loathe the Cena character. I dread to death weeks of the same "the Champ is HERE" promos. His character is an absolute douche with delusion issues.
This might be Corbin's rocket push incoming, though. If it is, I hope it's not for the title, as I think he should work through the roster and win lesser titles first.