Great post! Not Steem related at all, but I've seen a number of people migrate to lbry in the last few days, likely as a result of the YT purge. I myself only just discovered it after all the Twitter postings lashing out about the takedown, some mentioning lbry.
Storage would make it difficult for any decentralized video offering. It would likely have to be built, in part, on storj or BitTorrent or similar where each node must also store videos and provide bandwidth. Then there are the questions about legality of hosting some types of video content.
RE: "Decentralized" YouTube Alternatives on Steem? Nope, Not Yet | A Detailed Look at 3Speak and Dtube