I have been using windows since version 95. I even liked the Millennium version, that was most hated before Vista. I tried Linux several times, but Windows just always worked and Linux usually had always some issues(mostly drivers, lack of good programs and no gaming).
But now, after more than two decades, I am certain Windows 10 is my last Windows.
Nothing lasts for ever, not even Microsoft's domination on personal computers. It took them decades, but now they finally f'd up so bad that there is just no going back.
I think, like many people, it will take me few years to need to reinstall my computer(or get a new one). So I will still be a Windows user and that will skew the numbers for upcoming years. But I think that also means that in 1-5 years, Microsoft will see a massive double digit percentage drop of users, almost over night, and nobody will have a clue what is going on.
By then, I bet the distributions will be even better. The gaming will be event better. The drivers will be even better. The saturation will be even better. So the transition will be even more seamless than it is today.
I am looking forward to it. I think Linux, or open source and free OS, should have been the norm. But we took a bad turn in the past and got hijacked by few smart people. That will come to a natural end, finally.