And they can do this by making the game scale.Consoles or not, developers STILL have to cater to the lowest denominator among PCs because most people do not have the enthusiast high-end or even close to it. It has always been that way. That doesn't just go for graphics but for game environments and AI also. It is just exacerbated now by consoles because of their proliferation.
Besides that your average gaming PC is at the least on par with current consoles.