Going to 5K only about doubles the number of pixels, so it sounds like a solvable engineering problem.
Panels are ready and GPUs are ready; the link layer is why you can't go to Best Buy and buy a 5k monitor. DisplayPort and HDMI both suck.
I will give my firstborn for an 8k* monitor with a 120Hz refresh rate. He or she will probably have kids when I get that, though.
(4k is not that compelling. At 32" it's only 140ppi, which is nothing approaching "retina" levels.)
...one would hope that you're not viewing the 32" 4K monitor at the same distance you would view your phone from. Comparing PPI of a 32" screen to a 6" one is rather meaningless as the viewing distance is going to be vastly different.
The Chromebook Pixel has a nice resolution. That's 240ppi.
The ultimate watermark will be retina-level resolution for devices like the Oculus Rift, allowing you to move your eyeballs all around and see real-life-quality graphics.
Which is where you demonstrated that you are a power user. Most consumer systems don't even come with discrete graphics cards anymore.
Consumer systems took a big backwards leap when integrated graphics became the norm again. They're running several years behind the discrete cards someone like you or I might buy.
Also those games aren't too graphically demanding tbh, l4d2 is the newest one and it's over 5 years old.