Why do they need drones for last mile, they can just use their own existing delivery infrastructure. Drones might be cheaper/better/faster in the long run, but, they aren't required for this to work.
My comment was totally anecdotal from a big data insider who said cvs is already extremely concerned drones remove store visits..
The "technology" required is the same as the postal service have provided for centuries (think pizza delivery for more urgent situations). Sounds like that insider is spending too much time on pop business sci-fi and too little time understanding basic facts about logistics (and, very likely, regulatory restrictions).
Drones would be killer for pharmacies. Low weight and small packages