In terms of WWE booking, I don't really think Punk's UFC loss would hurt too much. Lesnar won his fight last year and got squashed by Goldberg.
However, I do agree that Punk wouldn't really budge on where he stands. ROH would be the #1 in my opinion. New Japan would be pretty awesome though.
To me, Bellator has kind of a bad reputation. It seems like the "TNA of MMA". Anything is possible though.
RE: WWE (apparently) Wants CM Punk Back