Why would Conan even want to go back to NBC after the way he was treated? For that matter, why would NBC want Conan back after what happened? It would take a mighty powerful spin machine to undue that disaster. Leno and Letterman are past their prime, although I don't think Leno ever had a prime. I'll occasionally watch Conan or Jimmy Kimel, and if I'm up late enough I'll watch Craig Ferguson (who is the best, IMO). I doubt whoever takes over the Tonight show will interest me enough to regularly watch.