And gnrfan, I have to disagree and say that I think Cena will win (whether or not it's anything like the above scenario). I can't comment on The Rock's motives for coming back, but I think they'll have Cena beat him. Considering it's in Rock's hometown, it has to result in a heel turn dammit! 
We will see. I just don't see Cena pinning or making Rock tap. I think Rocks ego is too big to lose in his own hometown at WM. I hope i'm wrong coz always been a Rock fan and i think him losing is actually the right thing to do. I also kinda see it as a great moment for Cena, who unlike many i have a lot of respect for.
I like your scenario as long as its not a cheat to win kinda deal. Someone should win clean in my opinion... and i guess in a no DQ match chair use is clean.
The worst possible scenario is a Cena heel turn and win via blatant cheating.