Oh as a gamer you can better just get used to it, because of DirectX 12 games that will come in time.
I've not used Win10 but all I do with Win7 is act as a bootloader for Steam. I don't really anticipate ever doing anything else with it, either. I assume there is something analogous to the old startup folder.
I mostly seem to spend my time running modded minecraft (FTB) on linux anyway.
The thing is, the majority of gamers will update based on the available cash, and so gamedevs will be targeting the expected hw base at the time of release.
So it really depends, whether you except the gamers to go on spending spree (nvidia and intel would certainly love that), or not.
A huge portion of the gaming market (China and large parts of Asia) is still using Windows XP. D3D9 renderers aren't going anywhere.