So, once the FAA has us all switched to space based navigation along with a tracking system (ADS) based on the same thing, is the plan to just shut down a big hunk of the country's air transport system when they want do test some new jammer? To me this would be equivalent to messing with half the traffic lights in a major city to test the potential for someone else to screw around with the system. And I don't think they would get away with just warning the drivers that the lights might be "degraded" for a while.
Seems to me, now that GPS is such an integral part of the national airspace system, the AOPA, EAA, NBAA, and even FAA should petition Congress to move such testing offshore to a place where it won't be so disruptive.