Also consider the limits of human vision. For most people, at a half meter viewing distance, something around 300 PPI is the limit of perception for most people

Also consider the limits of human vision. For most people, at a half meter viewing distance, something around 300 PPI is the limit of perception for most people. At a meter (where most people view the 27 - 30" big screens) it drops lower than that, probably to 200 PPI. Eventually it doesn't make sense to make denser panels because you don't see the difference anymore. This next generation of displays definitely isn't there yet, but it is "high" as in "we're getting there". I personally can't wait until we cap out pixel density, because then we can get variable refresh rate and color accuracy back. I want my 300 PPI vbr up to 120hz 10 bit color panel monitor for $300!