It will be the person who is larger than life right now. The guy who got booked to beat everybody he got in the ring with all year.
John Cena.
Cena has busted his ass all year long maintaining the hectic schedule and headlining pretty much every WWE PPV this year. He's had 3 classic PPV encounters (Umaga, HBK and Orton) and actually put on somewhat watchable matches with Khali. There's a reason I made a transition from Cena hater to Cena fan this year. Because he impressed the hell out of me (esp. in the HBK feud). Yeah, we all know he's been champ for too long, but that's WWE's call not ours. They're the ones rolling in the dough.
John Cena does deserve that slot in PWI. He's earned it.
Besides, think of the way they rank. They've had Hogan on top of that list many times, but he's not the best pound for pound wrestler. That's not what it's about. It's a combination of who got the most over and who wrestled the best hi-profile matches.
John Cena did both.