I don't really know what the answer is for dealing with unnecessary 911 calls on SPOT. The article had it right when they said:
“The problem isn’t whether beacons should be part of the wilderness experience,” he says. “It’s whether some people should be allowed out of their yard.”
What I do know is that SPOT is valuable and can save lives, as was the case a couple years ago when a climber out with my son fell and was injured.
Maybe the government should take the approach that all SAR calls must be paid for by person being rescued, unless they can provide some acceptable proof (after the fact of course) that there was a valid need for the call.
I believe that with the new devices becoming more popular and flooding the market, the incidences of unnecessary SAR callouts are going to continue to rise.