Some humans will be rich and they'll buy things. For example those humans who own AI or fabs. And those humans, who serve to them (assuming that there will be services not replaced by AI, for example prostitution), will also buy things.
If 99.99% of other humans will become poor and eventually die, it certainly will change economy a lot.
Not a lot of difference between an F-35 and a fleet of drones when it comes to it tbh. If F-35s are not enough then I don't see how drones will fare better.
IMO drones are just a way for Elon to get his foot in the door.
If 99.99% of other humans will become poor and eventually die, it certainly will change economy a lot.