It is still possible the Democrats could put McCarthy right back in. That is if he chooses to run again.
But even if someone worse than McCarthy gets in, what happens? Remember we are talking about one half of one third of the government. The new speaker would put a bill to torture kittens on live tv, and even if it passed the House it would not pass the Senate, and no way Biden would sign it.
When the Republican took the House in 2022 I predicted the would get nothing done. I am going to double, triple, quadruple down on that. No matter who or what they get to be the speaker.