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Mortars are not going to disappear because they are useful, but there are many known practical countermeasures to mortars, including mortar counter fire.
Drones offer a special new kind of threat because it is easy to imagine them having the intelligence to home in from many locales miles away and create an overwhelming & lethal swarm in a particular area. The ability to mass firepower is a basic combat strategy. Drones offer new ways to mass firepower quicker than ever from disparate military units spread over 100 square miles or 1000 square miles or 10000 square miles.
Personally, I think bitcoin will always be pointless to the average consumer, because hyperinflation AND hyperdeflation are the kinds of things that normal people would be wise to avoid. But I can imagine that someone might use bitcoin or similar technology as their secret sauce to back a new kind of normal-ish credit card. If the merchants had to pay, say, 1% off the top instead of 3%, they might be open minded to new technology and new risks...
An exchange (or some kind of moral equivalent) is a logical necessity to have sufficient liquidity for bitcoin to be a currency for normal grownups. Mind you, failing to accomplish such does not necessarily mean that bitcoin is not a "success" by some rational definition, only that it is not really "money".
(FYI: I would bet a large amount of money that MtGox will eventually prove to be an inside job.)