My issue is not with the power source or the viability of the craft, time and money will overcome the issues.
The Uber air machine still needs to land and take off on something around the size of two tennis courts or thereabouts. Where in the suburbs is this place? Where in the CBD can it land that does not involve a long walk to anywhere?
As we keep saying, a helicopter can already do these things but no one is using them regularly, including the super rich.