I’m a game developer and I will 100% confirm that studios have already started and will continue assuming the user has DLSS/FSR/XeSS enabled because it turns out rendering half as many pixels can get you across the finish line.

It was already fairly standard practice to try as hard as you can for performance, and when that fails to bring you to native resolution, just cut some resolution (for example, to 900p from 1080p).

However, I do want to add that DLSS/FSR/XeSS is great technology for the low end of the market who can’t afford insane rigs but do get to have a slightly sharper image than previous upscalers could accomplish.