Until not long ago, 1080p 60fps was the graphics performance benchmark for gaming. Possible consistently only on PC, it only became mostly attainable on console with the arrival of Xbox One and PS4. By the late 2010s things changed. PC hardware got more powerful, and consoles received upgrades in the form of the PS4 Pro and Xbox One X. Suddenly 4K or 2160p wasn’t so out of reach anymore. Similarly, HDR became normative on consoles thanks to their intimate association with TVs. On PC, HDR remains more on a per-game basis, with implementation up to the developers. You just need to make sure your display can handle it.
The net result is that by mid-2020, 4K HDR in 60fps or 60Hz is the expectation. By the end of 2020, between the new consoles and the new graphics cards for PC, it’ll be the de facto standard for all major game releases, with many likely to target 4K HDR 120fps.
In the present, 1080p SDR has staying power because it’s appealing for competitive gaming and e-sports, where speed trumps visuals. However, as graphics power increases and becomes more affordable (which is inevitable), pro gamers will also make the switch to 4K HDR as there simply won’t be any reason to not do that. Right now high framerate monitors in the 144Hz tend to be QHD/2K, but that will change as hardware arrives that supports 4K HDR at refresh rates way above 60Hz.