Never understood who still watched these shows, seems to me the ratings are so low it would be better to just show reruns after the local news. Not sure if most people don't realize or just don't care that the only reason a celeb does these is for the plug, but the same goes for the TMZ stories/hype those are also for the plugs before a movie, book, tv show or record comes out. Beiber just happens to slap a photog before a tour, Lohan just happens to make a scene in a hotel while filming a new movie, Olivia Munn's phone was "hacked" right before a new show, give me a break. It is the best free publicity they could have and people lap it up.
I might be wrong but I have heard in the "old days" celeb's would actually just show up to a Carson, Paar or Allen show for no reason other than to just be on the show from time to time, I guarantee you that never happens today.
Well, I watch Leno every day he's on. Sometimes the next day, always recorded. His opening monologue is almost always well written and deftly presented. I like many of his skits. Very few guests are of interest, and a lot are clearly "suggested" by the network, promoting other NBC network shows in an Oh-so-subtle way..... But it's always recorded, and the FF goes to near the end, where sometimes there's a new standup who's clever and funny.
The days of Carson, Paar and Allen are long gone.