Sheamus desperately needs a heel turn, his character has been so stale for far too long. But I don't see it happening any time soon.
I think he should lose the belt to Cesaro at NoC, and then go off to face Brock Lesnar. I've said it before and I'll gladly say it again, but I'd much rather have Sheamus, Orton or Cesaro go at it with Lesnar for the WWE-WHC, than the Big Show.