On the basis that the people who made the money out of the gold rushes of the 1800s were those who sold picks and shovels, the money will be made by developing a lightweight zero/zero* ballistic parachute.
Some multicopters appear to already have a degree of redundancy, so a motor can fail, yet the thing will remain airborne and stable. Full dual system redundancy (two independent batteries/speed controllers/gyro systems + enough thrust on one system to remain airborne) will be needed before the things can get down safely from the majority of failure modes.
I think I will spectate for now though...
*Works at zero feet and/or zero airspeed (usually applies to ejection seats).