I was thinking since the nVIDIA Shield tablet has HDMI Out, there is nothing stopping you from using that with the drone. Not seen anyone done this yet but i guess it should work?
The problem with the DJI Goggles if they ever come out, is that they will only work with the drone from what i have heard. With Oculus Rift you can use for movies, games AND FPV Drone.

Gooooood point! somehow i pray that the goggles are either cheap or multifunctional... like occulus wireless