for what reason? He has a chance for a title shot by winning the rumble. If this was in the summer, maybe. Maybe this leads to Austin/Orton.
Now there's an interesting set-up: Vince is forced to go to his mortal enemy to take power back.
If Orton faces Austin, who does Cena face? Especially if HBK/JBL is the title match, that leaves Cena with nothing to do.
If he were ready, I'd rush Batista back at the Rumble and have him pick up feuding with Cena there. You could keep him limited to interview segments and guest commentary, while rehearsing Cena/Batista II at house shows leading to Mania. Maybe have him squash someone in the midcard/upper card scene who could afford it. Like Mark Henry or Kane. Only if Batista were ready though.