Note that the requirement to keep automatic updates enabled only applies to the Home edition. At least, for now.
I suspect that our concerns are overinflated (though yes, any paranoia toward MS has been earned). The world of Windows is very large, from military intelligence data mining to slot machines. They may not use ASIO, but they use the other 99.999% of Windows services and features that a DAW does. MS has to tread very carefully to avoid upsetting major market segments.
So don't worry - if MS screws the pooch they'll have some heavy-hitters to answer to, including governments and multi-national conglomerates. Even if they don't care what our tiny market segment thinks, imagine what will happen if airport arrival/departure screens start failing. There would be a grand jury.
Having said that, I still don't entirely trust MS to not change something fundamental just because they can. (How many Microsoft programmers does it take to change a lightbulb? None, they just change the standard to "Dark".)
I am in the process of editing 300 report templates in my own software, simply because some French accented characters show up in Cyrillic under Windows 8.1. Windows 7 was OK and Windows 8 was OK, but they hosed something in 8.1 that's going to cost me a month's worth of work. Believe me, I am not a Microsoft apologist nor fanboy. I just trust that there are bigger players that'll hold MS' feet to the fire.