Since people still use XP and it lost support years ago, it shouldn't really matter too much what they do. If Win 10 works fine on your computer, just use it as long as you can. I never believed win 10 would be the last windows, that was just marketing or some such.
The point is, you can use it forever on current pc provided you don't buy new things after it stops being supported that don't work with it. Nothing in tech is forever really.