I agree with your breakdown of which model dominates which segments, though I expect that in-city drone never takes off except for extremely time sensitive/high value missions (organ delivery or something similarly extreme) because figuring out things like where to land tons of drones in downtown Manhattan just so I can get shake shack slightly faster without leaving my apt. My bet is that drone delivery will really shine when it provides next day for areas that have week-long lead times which is going to have to be fixed wing (or a really good hybrid) because of the ranges inherently involved.

I'm a huge fan of Zipline, I imagine they'll refine the parachute element of the operation.