I am just curious as to what data suggests this is going to be a hugely popular thing. In my mind there are two examples of recent products that were on the same lines... Second Life and 3D TVs. Both were unsuccessful.

I'm just not seeing where the insight comes from that this is something people will want on a huge scale. Even if you solve the current problems of the headsets being painful to wear over long periods. I just don't think people want their attention to be hijacked.