Stereoscopic 3D is much superior to VR, it solves all the shutting-out problems Phil is talking about. Yet where is 3D today, for all it's awesomeness? VR is a fad, it will go away as soon as it comes. There will be (are) people who are nutso crazy about about, there will be people who will use it all their lives (similarly with me and 3D, it seems), but for the vast majority, it's a fad. A fad's fad. A fad's fad fad.
3D tv really only provides a minor improvement to a normal experience. You get a increase in depth, but it's not huge and your FOV doesn't change at all. The general response of pretty much everyone I've ever seen try 3D tv is "oh...cool". Simply put, 3D tv just isn't a very impressive experience.
VR on the other hand, is an immensely impressive experience. I'm not saying VR will see huge mainstream success overnight, but it is a good enough experience and a good enough product on it's own to be worthwhile. It also already has a significantley more robust web of support as far as content goes than 3D ever had.
It will take time for VR to catch on, and I think mobile VR will be the type that brings the most people on board, but comparions to 3D tv are very shortsighted.
Bet with Adamblaziken:
I bet that on launch the Nintendo Switch will have no built in in-game voice chat. He bets that it will. The winner gets six months of avatar control over the other user.