The ASUS PB287Q, AOC U2868PQU and Samsung U28D590D all support UHD resolutions at 60Hz and DisplayPort 1.2 SST. That means that they support working with just "one tile", they don't give the problems the previous dual-tile solutions.
I don't really see the problem with these new monitors that are good enough for most people. Good price, the TN panels are quite decent (confirmed by reviews both at The Tech Report (http://techreport.com/review/26510/4k-for-649-asus-pb287q-mo...) and KitGuru (http://www.kitguru.net/peripherals/monitors/zardon/aoc-u2868...).
Yes, you do need the best GPUs in order to take advantage of games in 4K. And yes, OS support is still incomplete. Anyway those trade offs are not that important if you are not a gamer and you can take advantage of that desktop area.
There's always good reasons for waiting. They could lead to never take advantage of improvements: you know, new improvements could be on the horizon when the ones you waited for finally arrive. And the story repeats itself...