I hear that!
Speaking of 'Johnny' ... he has never been replaced. I expect Conan to do a fairly good job, but not everyone likes his brand of humor.
I wanted to like Letterman, but he bumbles too much and never quite recovers. Best thing about that show is Paul and his band.
Leno was good, a bit sharp at times, but knew just when to cut it off.
Carson reached across all lines with his humor, was never insulting and quite apolitical. Plus, he could laugh at himself, something that you don't see as often anymore. I still miss the guy, and the 'team' was priceless.