Anyone who has used Big Screen or Virtual Desktop for any amount of time will tell you these virtual cinemas/displays have a very high chance of all but completely supplanting monitors, TV's, and home theaters for a LOT of people, but I'd say we're at least 2 generations of HMD's away from that. Already they're wholly convincing that you're in a different room watching whatever size display you can imagine, but the present HW limits it to a cool novelty that teases the obvious potential and demonstrates there's a long ways to go.