I've said he is a bad speaker and had a poor debate. The fact is, he's a good effective president. I know you want people to piss themselves over the debate, but he is a much candidate than Trump. If you're just going to be useless and piss yourself, than get out of the way.
This is another thing. If Shapiro or Whitmer win, you're upending the governorship in a swing state. Sitting governors running for higher office usually take hits in popularity. People don't like when their focus is split.
So I watched a lot of Biden's rally and it was good. He had energy, his voice wasn't raspy, he didn't stumble, he was focused, and the crowd was engaged. I'm guessing a lot of the panicking Dems didn't watch it.