Uh, you're talking about a guy who got dumped by his girlfriend because his dong got burned off in a fire. Only to years later say that the scarring didn't really happen. Kane's character has ALWAYS been stupid.
Check out the pilot for my webshow WISHFUL THINKING. It is a show about a college student who fucks up his day and a Genie grants him the opportunity to do it all over again and he finds new and creative ways to fuck it up even more.
I think the amazing thing is how he makes every single role he's put in work. Guy is arguably the most versatile performer in history. I'm indifferent on his current role, but having him around as someone stated above would help improve the up and comers which is a good thing so no, he doesn't need to leave.