I just remembered of what could be another big difficulty, but I hope I'm wrong. I'm talking about the RenderCow version. When I made some tests with this some months ago, I found that apparently Vue requires that the rendercow version is the same as the main Vue engine. Vue even has an embedded feature where it tries to update the rendercow version if it's different.
There are many people around with earlier builds of Vue. Many people don't upgrade to the latest build or go back to the previous one when they have problems with the latest. For example, I only go to the latest build if I have problems with the one I'm using, otherwise I don't change.
Of course, this difficulty could be solved by establishing some rules. For example, by establishing what's the build that the community should use in order to use OpenVue. It's a bit restrictive but it would work, I think.