To my mind, this is the natural progression from flightsimming. It is to RC flying what TrackIR is to the sim. And, if you're going to strap on a VR headset to go even further, well do it for real, sort of.
You could always sign on as top gunner crewman aboard a B-17, they've done that too!
I am thinking you would need a reliable buddy playing spotter on the flightline, FPV might lose situational awareness quite easily. But it is an interesting thing; there is something freakish about doing a flyby, turning to look out over the wing... and seeing yourself standing there!