Has anyone considered "letting the house bust" to use a blackjack metaphor?
The next presidency is guaranteed to be a disaster. We can have our qualms about which would be worse, but I think it's pretty universally agreed that it will be bad no matter what.
Either Hillary can be in charge and the Democratic brand will take a hit, or the GOP who allowed inept Trump at the helm will be, and it will, IMO devastate the party for years to come, maybe forever. It could make them the next Whig party.
Even if you don't think it's that dire, in the very least, you'll have a chance to reboot in 4 years. Trump wins, that's not on the table and you have to vote for him again in the next election.
Why do that?