I'm always surprised when people post comments like this, and don't understand why TV celebrities decide to move on. Being on TV in a major role, like Kevin Eubanks in his role for Jay Leno - means that he has made some MAJOR MONEY over the last however many years he's been bandleader.
If he's no longer enjoying the role, he has the financial freedom to move on and try something new. If his career tanks, he can stay home and enjoy a luxurious early retirement. At the worst, he can play some gigs and only play the music he likes.
Come on - regular middle class people take career chances all the time, when they are actually taking a big gamble on their financial future. Why is it so amazing when a rich celebrity does it?