How will the lack of ground stations affect navigation?
GPS/WAAS will replace all but ILS in the end. Even now, with graphic displays, smart-lookup from databases, and a line to follow presented to the pilot, VOR use is rapidly falling by the wayside, and point to point navigation will become the norm (and that was occurring in 1996 even, I recall getting cleared direct to a waypoint that was off my paper chart and having to ask for a heading to put in the autopilot to fly the plane while I found it on the chart).  In my airplane, my AVIDYNE IFD-540 does all the work, and I have ILS for precision landings and VOR if needed. Nearby VORs are going away.  DME and ADF were pulled out of my plane years ago.