I think this is way too optimistic. I suspect these things will be only available to the already-quite-wealthy. While the poor (i.e., not billionaires) are left to rot and starve without jobs, property, or livelihoods. Then, when the poors (i.e. us) become too much of a headache, these things will be deployed to murder the poors (i.e. me).

I am imagining a world somewhere between the movie Elysium and Oblivion.

> I suspect these things will be only available to the already-quite-wealthy.

Initially, sure. But the price will come down in time, just like with any other technology in history.