what?...the UFC was main-stream material even before Lesnar became WWE champion...
now putting that sports entertainment aside, as long as Dana White is running the show, he'll give the 'true' mma fans what they want as far as who should fight who. the way i see it, the ufc would do with or without lesnar. the ufc is the reason why lesnar has had a chance to bask under the mixed martial arts limelight. w/o the ufc, lesnar would just be another character...another wrestler turned mma. so would the ufc survive w/o lesnar? definitely. they're prepared more than ever to move on to bigger and better things if lesnar can't fight any more. trust me. dana has always had another trick up his sleeve just in plan A doesn't work according to what he sees fit.