It needs to be cheap to manufacture, Cheap to buy, it needs to be lighter and more compact (AND ALSO SOLVE THE ISSUE OF SWEAT ON THE FACE AAAAAAAAAAAAA). It needs to solve the issue of "VR Legs", Personally I've developed my VR legs, but I know some people just can't. It needs to be useful enough to take it everywhere as currently it doesn't have any real use besides gaming.

Honestly, I don't see VR becoming any type of mainstream until full dive is developed.