I feel like approaching VR's adoption as "cost of device" as the problem is the wrong approach ...
People want super fun activities they can do and as far as i can tell most non VR enthusiasts who have tired it has found that "fun, but only for a while".
No lowering the bar of cost entry makes something "fun, but only for a while" any better.
Not that I think Carmack or any of the talking heads in the VR world have all that better ideas that will increase adoption.