YouTube itself is bound to implode because of the cost of all that infrastructure… sheesh. I recently reduced my YT time to the bare minimum, after being screwed out of premium (light), and found out about Peertube. It’s pretty bare bones, but viral videos can use P2P to offload the main server, which I thought was smart and fair. So, federated YouTube can be done I think. It won’t be easy though, or cheap.