The Nexus (CM Punk) feud with Randy Orton or with The Corre.
I'm a little torn because this means a feud with a former champion and could mean some awesome build up between CM Punk and Orton, but if Nexus takes on Corre I feel it could build up a bit of a well needed midcard with the teams of Nexus and Corre actually getting some wrestling time as well while Punk and Wade Barrett have a feud that pits two awesome (hopeful) main eventers trying to outdo one another in beating down the other team. It's something that can at times make tweeners. It seems like there's no real unsatiable competitive drive in feuds not involving a title and this would be a way to induce one. You'd actually hopefully have decent tag matches (I mean in the sense that no one will just get squashed or predictably win (hopefully). And who knows, we might even see.....oh my god....a six man tag team match!
I actually can't remember the last six man tag team match I saw.
If Nexus stays focused on Randy Orton you just have a bunch of group attacks and Orton beating down Nexus one by one, but at the same time this also allows Barrett to go after the world heavyweight title...or the Undertaker...
Though I sincerely hope they don't have Randy Orton and the Corre vs. Nexus. That makes Barrett a second fiddle to Orton subsequently making Zeke third fiddle (They claim to be equal but come on, really) and so on. That also puts two "main eventers" on Corre and only CM Punk on Nexus. You have an interesting dynamic in Zeke vs. Mason, but after that it just becomes "guys from Nexus" vs. "guys from Corre" And I just doubt anyone will really establish themselves.