In practical terms, these 'alternatives' will be seen by a great many as an exercise in reinventing the wheel.
Many content producers wouldn't have the skills and/or the interest in travelling down a path that requires them to put more effort into publishing their work ... yes, even if it meant they bailed out completely. Another issue is the potential for multiple "standards" in exactly how multiple hosts are configured and accessed. The list goes on.
Then there are the costs involved in providing an effective service (read bandwidth and capacity).
It may appear to be a solution on paper, but real world issues will be a significant barrier to success.
And all this talk of setting your own CDN or moving to another CDN service like Vimeo etc is only valid for those who
already have a large audience and can potentially take some of them with them.
It is not an option for someone starting out, even if they have the best technical skills in the world to implement it.
Even something as huge and ubiquitous as Facebook (and who claim to serve more video than Youtube (which is bullshit, but we'll run with that)), used by more than a billion people a month, count how many people make a full time living making video content on just Facebook. Name one person who is known for making original video content on Facebook. You can't. There are reasons for this.