They already pushed too far. Was a life long Windows user, used at home for gamedev and Steam, chosen at work (mainly QA) because it's what I knew extensively, VS is great and it's what users used. Was literally the only Windows user in a sea of OS X machines at some companies.
Now? All my personal and work devices run Ubuntu or Arch. My partners devices now all run Ubuntu or Arch. Projects I'm planning that were going to be "Windows first" will now be "Linux first".
Sounds silly, but I was enjoying the progress Windows was making security-wise. From Vista to 7 and 7 to 8 (and even to 10) the "under-the-hood" part of Windows seemed to be making great strides in protecting the user, even if they were screwing up the UI.
But everything they've pulled with 10 have completely pushed me away from the platform. Adverts in my OS? The nagging? The "updates can be installed even if you really don't want them"? Phone-homeing I can't turn off at all with a consumer edition? I understand wanting to make it hard to turn it off so they can collect reliable stats or protect the consumer from themselves but as a technical user I want my OS to do exactly what I want it to do. MS completely killed that.