I've made most of my arguments in other replies, but here I'll just say this: Most of what is on YouTube is worthless garbage.
They've developed a business model around being the garbage collector and storage provider for home movies, dipshits that want to be viral by pranking people, your cousin's drum solo during their recital, every awful cover of all of your favorite songs, and some guy's unhinged political rant (recorded in his den at 2am)
I think maybe it would be ok if they posted their stuff to some federated provider that charged a few bucks per gigabyte. They sure wouldn't lose money on bandwidth; the videos wont get viewed more than once. If that.
As for actual creators? They'll be able to self host, or band together and make mini-services funded by like-minded fans (and probably some sponsors, because capitalism), and everyone will be able to access everything on an interconnected... what's the word? Oh yeah, "Internet". You know, the thing we had before 12 companies took over everything.