I'd be honestly happy with my Rift as-is if they bumped up the resolution a bit, and had some way to see the real world with the headset on (even camera passthrough is fine!).
I've used virtual desktop apps in the Rift, and they aren't bad to use, and playing games like tabletop simulator is so intuitive and nice that I'm floored tht this hasn't been tried commercially yet.
I assume there are some pretty significant hurtles that I'm missing, or maybe the market is still hilariously small at this point, but it just seems so close!