I don't think there is any chance of Powell going to Wigan, and very little chance of him going anywhere else before next summer at the very earliest. Only possible place would be Leicester and I think they would want someone with more experience if Pearson fails to deliver (although they are my favorites for promotion with him in charge).
However, if CP shocked us and did go to another club in the near future it would mean one of two things:
(1) He is not the Messiah many here consider him to be, whose identification with, and loyalty to, the club transcends his inexperience and occasional fumbles as a manager. (To such an extent that many would cheerfully stick with him even if we get relegated.) We were just a rung on the ladder for him. In which case, no great loss.
or (2) There is something so seriously wrong within the club (finances, dissension, malpractice, worthless promises, or whatever) that he feels driven out, much as he would love to stay. In which case we would have more fundamental problems to worry about than who is team manager.
Hopefully neither of the above situations apply.