Considering how much cheaper 4K TVs and monitors are getting, I'd actually expect the number of people wishing they could get playable frame rates at 4k to grow quite considerably. Portal 2 was nice to replay on my 4k60 TV, picture captions and other little details that were just blurry gibberish at 1080p become readable without camera trickery to get closer. The added real pixels sharpness and reduced aliasing are also always nice to have at least in my book.
It'll be one of those things where people tell themselves they don't care about it while the ticket price is exorbitant but once it enters their pricing comfort range, most won't want to go back.
I didn't care about 4k until mid-range 50" 4k TVs dropped to $700, then I got one to replace my 24" CFL-lit secondary monitor and 22" tertiary monitor with a dead column.