It was Stephen Budiansky who said that with aircraft (before WW1) it was easier to change the reality than perceptions of what was possible.
I was on the beach yesterday and there was a teenager trying to use a drone to get photos of the naked women. It made so much noise and was so obvious, that he got lots of moon shots before being chased away.
So to change the reality there remains little questions about noise (the teenager’s toy was the size of a dinner plate and made more noise than a baby bee motor used to), battery life, range, weight and aerospace laws. But people have seen computer simulations and so the perception is that flying urban taxis will be at an airport near you, ready to take you to your front door, tomorrow.