They won't do excrement. Either they will chicken out or it'll end up being a couple of them that do it and no one will care.
It's political suicide should they not. Certainly in the long game it's in the party's best interests to move on from Trump (inevitable listener's fatigue) and what they could use is a cynosure of sorts outside of crusty 'old establishment' Chaney. Question is would they have the stones to put Tim Scott front and center?