4k gaming is not standard. I know 2 people that game in 4k. Most still use 1080 to 1440.
It
is standard. Meaning it is a standardized incremental (multiplication) resolution, supported by all operating systems and the graphics APIs & drivers, and developed against by AAA game developers so that it pretty much always works.
You probably meant to say it's not
popular for gaming. That is accurate but doesn't matter at all for LP's question which was is the panel worth getting.
For that question prizrak's' answer is accurate so it depends on the use case, panel size and/or viewing distance and budget. So without more information there is no good answer.
Now for the opinion part of my post:
4K-UHD starts to matter at about 50" @ 2m viewing distance. Further/smaller than that I'd say 1440p might be good enough. 1080p is such a garbage resolution that the panel has to be very far and/or very small for it to not look like garbage by today's standards. In my living room, I have a 40" 1080p panel at a 3m viewing distance and it looks somewhat reasonable. Similarly, for work I use 1080p panels (22" and 24") and there's no getting away from the fact that the resolution is garbage for that size panels; muddy and aliased in almost every use case.
Having said that, the trouble with television panels specifically is that no one makes anything in between (i.e. 1440p). So either you get a 4K-UHD capable television or you're stuck with 1080p which really limits the use cases and viewing distances available using that panel.
Btw, the PS4 Pro doesn't always render native 4K-UHD. It uses dynamic resolution rendering and sometimes so-called "checkerboard" rendering which is more like 1920x2160 pixels. I can definitely tell when comparing it to native 2160p coming from a PC. The PS4 Pro looks high fidelity but still comparatively muddy. But it gets away with it because people generally speaking don't use consoles from a viewing distance where they get the full benefit from native 2160p.
When it comes to PC gaming at 4K, everything depends on game, but with NV Pascal (starting at GTX 1060) / AMD Vega based GPUs you can already render some games at some low-ish settings at 2160p anywhere between 30-45 fps (i.e. console tier refresh rate). With a GTX 1080 you're approaching more sustainable 45fps at medium-ish settings in most games, and with a 1080ti more like 60fps at medium-high settings in most games. (But in my opinion the card needs to be a liquid cooled one in this use case as it's always screaming at full power.)