A big CDN could do it, I think cloudfare recently launched a new video service. If they wanted to, they could build on that. More likely would be something like

A big CDN could do it, I think cloudfare recently launched a new video service. If they wanted to, they could build on that. More likely would be something like wordpress using this as a back-end. That feels like a great open-source project. Discovery could be done with RSS, trying to copy the podcast model. Whilst its not great to replace one big company with another, it is at least good to have an alternative to keep youtube from being too crazy.