No, dont. Really, just dont.
I work in peripherally related fields and there are HUGE problems with the smaller drones. One of the largest is no one wants to spend money on them.
Re urban/suburban delivery: I and most of my coworkers are very skeptical. 55lb is not a lot or weight, weather will be a problem, active surveillance ie radar, FAA, punk kids, insurance, gynormus racks of lipo batteries recharging give off stupid butt loads of heat, reliability of the small UAVs are bad.
Can you make a drone to deliver 5lb over 20 miles - yes. Can you do it profitably - maybe but other tech is much easier & more reliable.
Re big UAVs? VTSAX already covers them.
I would much rather invest in an etf dealing in pot than UAVs, lots of people are willing to pay money for pot. And in someways there are fewer problems with The Man :-)
Are "Segways" everywhere or are cheap knockoff "hover boards" everywhere? I assumed they were made by different companies.
I do own IGM (north american tech) but I have no interest in rolling the dice to pick a winning sub-sector.