Apple's (and by extension every VR platform) big mistake is the lack of a Killer App for VR.
If they didn't have a compelling use case, them researching and building any VR device is a waste of time, money and effort. Walking out on-stage and saying, "Now you can see dinosaurs in VR" just isn't a compelling use case, even if they weren't expensive.
To me, a decent intermediate step would have been, "Have and unlimited number of huge screens for less than the cost of one big, high-quality monitor." would have been compelling if it were made small and light enough. Finding a way to continue using the current keyboard and mouse would have made it much more affordable and approachable.