IMO it's extremely difficult to sell a $500 VR system that only works with a specific console. Until they make it 100% compatible with PC, I don't see them making any progress with the hardware.
I'm also of the opinion that VR needs to be as accessible as possible and tethering your self to a living room console is the opposite of that. The Quest still has the right idea IMO... a powerful stand-alone headset that you can use all over the house or use on the go.