Good Thinking
But it has a LONG way to go to be practical. There are many problems (as previous commenters have stated) but as a pilot I think a manual option is guaranteed doom. Most people can't drive a car safely, forget about something travelling in 3 dimensions. Full auto or nothing.
The idea of sharing has been brought up before & I think its spot on. Keep the fleet of automated flyers moving constantly & eliminate the parking issue. Only fratboy BMW drivers will demand their own craft and fuck them. Don't need them anyway.
