What could go wrong is that instead of the current socialist we could elect a different socialist who will rule with the explicit and tacit consent of the gop. Much as I think the gop is largely useless, it at least makes of a show of opposing radical measures when they emmanate from the other major party. That won’t be the case if the socialist in question has an R after his name.
Giving another four years to the worst ever, most destructive administration, pro-muzzie, pro-death, pro-Marxist, etc., etc. to "send a message" might be even the single dumbest idea I've ever heard.
In the vernacular, it's been called cutting off your nose to spite your face.