The only thing that can keep it from happening is for enough people like you to convince enough other people that it can't be done.
Levin should understand that to undo 100 years of progressivism, we will need decades of hard work and changing the culture back, marching through the institutions and what not. Putting all hopes in a super long shot will be what prevents people from focusing on what can be done. Trump is a first step towards that goal, but Levin can't see that.