I'll start to worry about unmanned aircraft eliminating my job when I see unmanned freight trains rolling across the country, unmanned cargo ships plowing through our harbors, and unmanned eighteen wheelers rolling down the interstate.
When the first unmanned drone fireballs into a residential area out of control (accidental or intended uplink interference), that system will get pushed back out to the far reaches of the uninhabited desert faster than you can say "Remote Controlled City Taxi".
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