Since I did not have the experience of 60fps+ long enough to be sure, I wont try to argue too much. Let me just say that I am sceptic, a lot… The short try I had on a 120hz screen didnt leave me with an impression of missing anything (with a 60hz in comparison).
To me it feels a lot like the Hi-Fi guys who claimed they could definitely tell the difference between compressed audio (with a decent algo and decent settings) and audio at CD quality or more. This has been debunked with scientific A/B testing quite a few times by now, leaving the believers in the dust with not many arguments left.
I also remember reading a paper demonstrating that people couldn’t tell the difference after around 50fps ; if I find it back I’ll forward.
But even if we could discern, there is still some fundamental issues making the purchase not really worthy : what about the GPU. Even my GTX 980Ti can’t output that kind of FPS on the latest AAA games only at 1440p. Since we are talking about movement for this to matter, it is really only useful for games therefore I don’t see how one can justify that need when you can’t fulfill it to begin with. Unless you go 2-3-4 SLI, but at this price point if one has that kind of money to put in a gaming machine I don’t think there is a need for a rational justification.
For movies, I think The hobbit showed to the world how little more than 30fps bring to the table (nothing…) and for everything else, well 60fps is just fine really.
In my opinion, this is just beliefs but I would be happy to be proven wrong with a scientific testing, in the meantime I’ll keep believing what my experience tell me in opposition to what other people would like me to believe. Everyone is entitled to his opinion I guess.
For 5k, saying it is here is taking quite a shortcut ; not only the pricing put it out of reach of most peoples, but there is still the fundamental issues of software support and GPU need. The 5k iMac already has issues running Mission control without lags. Sure it does not have the best GPU out there but we are talking about a GUI, not a AAA game. Those simply do not run at this resolution unless you put everything at mean which completely defeat the purpose of having a gaming machine in the first place (and high resolution gaming do not bring that much to the table in the first place).
I think it will take way more time to get a decent percentage of people running these screens than you believe (5 years+ at least). Currently this is less than one percent of the Steam user base so I wouldn’t hold my breath.
But I guess this is the year of the 4K hype.