But we already have a sparse scattering of VORs? Take an IFR flight over Europe and how many existing intersections /waypoints sit on top of a VOR?
I can well remember flying a 1991 Citation 2 with glass from Nice to gatwick! the screens went black. It took a few hundred miles before we managed to get everything up and running.
I was given direct to a VOR some 200 nm away missing out scores of VOR less intersections.
I cannot see a time where VOR/DME will go completely especially in terminal areas but we already have a situation where they are more sparse.
Pace