Anyone in a position to allow a platform to get serious traction isn't going to give that control up and anyone that isn't can't make a system with enough traction.

InfoCard is surprisingly non-evil, and I also think Firefox is ideally placed to work on this (oh look, here's the solution: http://www.azarask.in/blog/post/identity-in-the-browser-fire... ), but they don't seem to care enough.