He probably does think the rules are daft, but the railing is part of the act.
It’s become so, but you can see he is genuinely confused and frustrated by its draconian and arbitrary rules sometimes.
Comparing it with the post-watershed rules of UK TV, he’s right to be annoyed by it.
Here’sa story speculating about this very situation. Some non-traditional names they tossed out:
Reggie Watts
Joel McHale
Seth MacFarlane
Amy Pohler
Ellen DeGeneres
Chelsea Handler
Seth and Ellen are the most intriguing in my opinion. I think they would both bring an interesting twist to the late night wars.