A most interesting look at the subject and I think Hermione isn't aware enough to realize the real dangers that multi-spectral imaging satellites would pose; especially if the magicals don't know and/or understand them and can't ward against observation by them. I have to wonder just how much the various intelligence agencies do know; especially with muggleborns getting disgusted with the magical world and returning to the non-magical.
As always, an interesting read from you.