Perhaps not the equipment itself, but the high ground it occupies. Perhaps the staff who work there? Any Chinese post-doctoral students doing research there? Maybe DoD wants to use the spot for their own observation?
It won't be shut down for long.
The high ground? I would imagine high end drones that anyone with $$ could get would be more of a threat.
And if the FBI is making such a public deal of the high ground/observatories near White Sands, would this not trigger satellites from other countries to focus on the region?