Microsoft isn't like Apple. Windows 7 will be supported until 2020, so you can keep using it until then. Heck, 40% of the world still uses Windows XP today and that OS is 11 years old. If you NEVER want to upgrade, no one is making you. That's why I find these posts silly.
Well, it's supported until then, but to what extent? There still hasn't been anything official regarding if DX11.1 will be ported to Windows 7 or not
And sooner or later, one will be "forced" to move onto the latest version. XP has had a long life, but now we see more and more games being Vista/Win7 only due to XP not supporting DX11.
If Windows 9/10 is even more tablet-approached and has DX12, gamers will have no choice once games start using that(granted, it will take long until that happens)