When will VR become something more substantial than rail shooters and tangled wires on the floor?
When the hardware necessary for total immersion becomes cheap enough for the masses. The biggest hurdle is movement, which could be overcome with omnidirectional treadmills, but those are ridiculously expensive and there's not much software that takes advantage of it yet. And that's not even taking into account that you need a pretty beefy PC to properly run an OR/Vive, which means the pricetag on the experience is still prohibitively high.
tl;dr It's going to remain the domain of early adopting enthusiasts for the foreseeable future.