Heh, I've actually seen a setup with 3 60" 4k doing nVidia surround, NCIX in Vancouver had it set up at a mall showing off the 1080 when it first came out, playing some racing games. Looked cool, I immediately thought that it'd be great as a full sized cockpit/airline sim in a basement.
I imagine running 3 of these new ones would take a Titan XP SLI setup at the very least. Still, I'm hoping they are around 2 or 3$k USD, I'll consider one seriously then, but not for $5k which is the rumor mill right now.