David Letterman announced last night that he’ll be riding off into the sunset sometime next year. If he leaves after 2.1.15 Letterman will have been hosting a talk show for 33 years straight (not counting the hiatus between the end of his Late Night with David Letterman NBC show and the 1993 start of CBS’s Late Show with David Letterman). Letterman has obviously enjoyed doing the show. He thinks he’ll be happy not doing it, but if he doesn’t engage himself in some kind of engrossing, satisfying work he’ll wind up feeling empty and antsy and possibly even miserable. Nobody who enjoys doing what they do should ever retire. Truly creative people stop under one circumstance and one circumstance only.