Maybe I'm being cynical, but I'm skeptical that whatever "open standard" Twitter is working on will achieve that utopian future you're dreaming of. In practice, I think the vast majority of people won't even know it exists and will continue to exclusively use their preferred platform (Twitter, Facebook, whatever) despite all the issues with it. The idea of being able to move all of your content to another social network at a whim, with all your connections undisturbed, is (IMO) simply never going to be something that your average user does, no matter how technically feasible it is.

Hopefully I'm wrong and I'm not giving enough credit to social media users in aggregate.