Not unless they're complete boneheads (which, admittedly, is not impossible). If they do that, they effectively lose embed-video-in-external-sites functionality, and that might just be enough for unpaid content creators to dump the platform en masse and cause their effective monopoly to crumble. The content creators who are actually making decent money may never leave entirely, but if another viable platform comes into existence, I bet most of them would mirror to it.