Leno is the biggest attacker of NBC ineptness and I can't imagine the constant attacks go over too well, when the big wigs get together in the conference room.
I record the Tonight Show, and very seldom fail to get a great laugh or two or three from the opening monologue. Stick for guests I might like, or new comedians, or musical talent. I imagine Jay himself might want to get out now. Who knows?
Letterman was fine years and years ago on the Late Show, but I don't like his persona at all. Kimmel doesn't even merit these seven words.
Instead of trying to improve their programs, they rather get rid of Leno.