This functionality would make the controllers so much more valuable to me since these are the only one I own. Would love to be able to switch services and still be able to use them wirelessly on my tv instead of having to plug them in my computer.
While they haven't committed to doing this exactly, it has been hinted from the beginning that enabling this may be something that will happen eventually. I haven't heard anything about it for a while, though, so I think it'll just pop up suddenly (or not) at some point.