I mean, your thinking is actually factually wrong. He's already a force without being at debates. He's been able to hijack the entire primary process and essentially run his own so far. He's had great results doing that. He's already viable and he's already a threat to the nomination. That's on you for choosing to ignore that I guess.
Yes, Chuck Todd will be his usual terrible self. But the candidates, if they're savvy enough, will navigate through that. If they fail to do that, they have only themselves to blame.