This is a joke, right? Colbert's just going to ad-lib his whole show?
I can understand Leno and Letterman putting on a bare-bones show without monologues in order to save the jobs of non-writing tradespeople who work for them. But Stewart and Colbert are all about the writers. What the heck are they going to do?
...Good question...
And will it be immoral to watch them?
Probably not. If anything, it'll make you realize pretty quickly how important writers are.