Switch to Win-10 from stable and wonderful 2009 Win-7 Pro 64x?
Not at gunpoint.
Win7 Pro x64 was the best Windows release ever. I don't think they can possibly surpass the combination of useful power, speed, ease of use, intuitive GUI, and the ability to customize the interface back to something even simpler (I personally prefer the Win2000 look+feel).
Win10 is arguably faster -- under the hood. But at the GUI level it's considerably worse, at least for the work I do.
Just remember, if you stick with Win7, security updates stop in two months, and you will be VERY VULNERABLE if you go out on the internet with it.
W7 support ends in January.