The Air Force has done that in years past, just on a smaller scale.
Yes, I can navigate by VORs, but why would I? I have inertial navigation and area navigation built in to the plane. And if I get desperate I can ask one of the ATC bots for vectors.
The lack of GPS will only affect my approach capability. I won't be able to fly GPS-based approaches, but I don't do many of those anyway.
At least those concrete arrows are still in the ground in some places.
I saw one of those many years ago. Pretty cool to actually see it instead of reading about it.
If all else fails, I'll pull up Google maps and do a little pilotage.