No. Nothing is guaranteed except death and taxes. Anyone who believes YouTube needs to continue to pay "vloggers" is foolish. Tick tock. If these "Celebs" don't have a back-up plan they better get one soon.
You do realize that FB pays these people too, right making it impossible for youtube to stop or else the youtube stars will not publish to youtube only videos telling you to visit their FB videos.
You seem to not understand how anything works online. You are telling people that mastered the art of making money to have a backup plan? Give your little speech to the avg. american who is a paycheck away from homelessness.