I'm OK with migrating to GPS nav, since VORs are very expensive. I don't like mandating expensive requirements to GA, but GPS isn't that expensive especially for a VFR pilot with a hand-held.

But what's the backup for IFR if the GPS signal? Radar Vectors? INS? Now THAT costs money.

Also what about security...let's just say that I have intimate knowledge of GPS jamming and it's not that hard. Since it's a LOS signal from space with almost nothing but a little air in the way the signal strength is vastly lower than a VOR.

Maybe the thought is keep VORs at the big metro airports for that reason. An enroute jamming attempt would not last long since the airplanes would fly out of range quickly.