NEW : Mediaweek analyst predicts at least one among Leno , O'Brien and Fallon will leave . NEW : Leno to host half-hour show starting at 11:35 p.m . ET ; Leno dismissed them on his show on Thursday night , telling his audience , `` It 's always been my experience O'Brien moving to 12:05 TV host moved to 10 p.m. slot in September ; ratings have been low .
NEW : Mediaweek analyst predicts at least one among Leno , O'Brien and Fallon will leave . NEW : Leno to host half-hour show starting at 11:35 p.m . ET ; O'Brien moving to 12:05 TV host moved to 10 p.m. slot in September ; ratings have been low .