Theoretically sound I guess but it also sounds expensive. I guess they've crunched the numbers and it is considered to be potentially a better value for the buck. That's the government for you - once they get a capability to spy and micromanage a situation they just can't get enough of it. It seems to be a trend in everything they do.
It would be a good idea if it worked. Still testing process. Means it is already been done.
Not so long ago I'd have disagreed with you. Think of it as a problem of mechanical devices and communications. Functional, fueled aircraft with sophisticated electronics kept in a water tight storage potentially under great atmospheric pressure for an indefinite time. Then it would have to detach on command, rise to the surface and provide a launching pad for the aircraft before it could sink again. Not so long ago I'd have thought this was pure science fiction. But after what NASA did with Curiosity I don't doubt anything they say any more about feats of engineering. Leaves me a little breathless and hoping they never decide to turn all that ingenuity against poor old me