Unless Trumpism is not only defeated but purged from the party, he will be. And should be.
Real Republicans have been meeting while the Trumpfest has gone on in Cleveland. They are plotting a counter-revolution already. When 2018 and 2020 come around, they will be ready. And unlike Trump, they are savvy professionals who know what they're doing.
They were blindsided in 2016. That won't happen twice.