He was up and down this year but how much of that was on him? The o-line was one of the worst in CFB, we didn't have much of a run game in a month, Whipple was well Whipple.
I think a lot of his down was due to the porous OLine. I say try to keep CT and Trey. With Prochazka and Nouili coming back, the OLine will improve and so will the consistency of CT.
From what I have seen watching Baylor games under Rhule, Thompson is better than the QBs he was winning with. So I'd say if you can get a better portal one fine but he is extremely far from the biggest issue to address.