Well, the concern I have is about alternatives. Joanna Videoessayist might not have the technical know-how, the business acumen, or the capital to build her own platform — she just wants to make great video essays. Eliminating platforms like YouTube wouldn’t make Joanna better off, it would just cause her to return to her marketing job.
No one is eliminating YouTube. We're making a better open source alternative.
If it's good enough, she will leave YouTube just like her mom left AOL and embraced the open Web. Why did content creators leave MSN, CompuServe, et al ?
And now replace teaching with pretty much any other content. A musician giving a concert, TED talks, etc.