Edit: As far as I can tell they're just yanking support from Windows and tough bikkies. I asked Bing about it and it basically said to buy a different headset or hope a third party releases alternative software that can run the headsets. Oh and also no you can't prevent Windows from auto-updating and disabling it.
Extremely disappointing behaviour on MS' part. I can understand them sunsetting development, but actively rendering fully functional devices unusable is criminal.