Yeah, there’s a lot of people I wouldn’t support in a primary that I would be happy to see. He was never a favorite, but I soured on Buttigieg when he abandoned his sort of forward-looking original platform to compete for the center track, but having a younger and charismatic candidate I can trust to handle himself in front of the camera would be a fantastic relief.
You have two counter examples, and one of them was incredibly successful, just for the side where success is bad for the country. Reagan wasn’t ineffective, he was effective for evil purposes.