Win 7 will remain fully functional and still receive security updates until some time in 2020. Then it will start being a liability, as XP is now.
I, too, plan to keep running 7 for a good long time. But I expect I'll switch to 10 at some point.
If the software I use and the connected hardware gets stable drivers and updates, I might consider it before being forced to upgrade but for now, the sole problem I have is the loss of focus bug I can’t seem to sort out. Everything else is rock solid.
Any guidance there on the foocus thing would be greatly appreciated BTW.