I believe they can fumble and fail upwards into the white house again simply because as soon as Donald dies from acute Big Mac poisoning, the rest of the GOP will turn on itself trying to be the next "God Emperor". If it happens during an election year and they don't have time to get their shit together (and they won't, because every single one of those hyenas are self serving and ready to stab each other in the back), the Dems might just win by default. Of course, they will accomplish nothing during that term, but still.

In Australian English, this tactic is known as "doing a Bradbury", named for that time Steven Bradbury won an Olympic gold medal in a race where he was coming dead last by a significant margin but the front runners fell over and caused a pile up, and he was far back enough to not be involved in the shithow and cruised towards the finish line.