I'd say we're probably closer to 25th amendment territory than impeachment. It isn't clear (to the extent the law requires) that Trump has high crimes or treason, and whether he will or not is immaterial until he does. It does appear very clear that he is not fit to discharge his duties, however. What is going to happen the first time there is a crisis like a shooting or a hurricane. The next time the south gets wiped out by a cat 5 they are going to be BEGGING for Brownie to come do a hell of a job.