YouTube is the only one that doesn't have an alternative. I mean, there are other video hosts yes, but the content isn't there.
The creators need to start moving. Their fans will likely follow, since it's not YouTube they are there for. But I don't think anyone else offering free, large scale video hosting does much more, if even that, than what YouTube does. Even if it sucks, it's better than nothing, so there is no incentive to move for anyone.