This has been predicted as a mutational strength of the internet. Any part of it that someone attempts to monopolize or dominate simply creates an alternative somewhere else that all of their business flows into overnight.
YouTube like Wikipedia and Facebook and Google is creating their own successor and driving customers into their arms. This isn't the old media and unless they shut it down worldwide there will always emerge the alternative.
All things that are too successful tend to sow the seeds of their own destruction.