Eh? People have been pushing greater than 4k for a long time - in the form of Eyefinity, nVidia Surround. I see lots of people happily taunting triple 1440p/1600p monitors and getting fantastic results. Even people running 5760x1200 are not far behind the 4k barrier in reality.
Haha, I still have that set up in the living room. Looking forward to Steam In-Home ********* so I can stream from my upstairs rig to my HTPC.