No, it could easily happen before that. Everyone except Trump is replaceable, and that’s especially true if they fuck up in a very public way.

In fact, Vance taking over and trying to purge the hardliners would hasten the split of the “true believers” away from Vance. That will happen, anyway, but it’d happen faster.

For historical examples of what happens when the fascist boss is mad at you, see Rudolf Hess or everyone vaguely related to the July 20 assassination plot (even Rommel!).