Not bad !
Glad to see you've finally got your head out of the clouds Lewis.
This is a good, objective article on your pet subject for once.
Although I keep pouring cold water on the idea, believe it or not, I'd like to see it come true as much as you do.
Unfortunately I do still have some cold water for you. Suppose, for the sake of argument, it all came to pass. Now just where would you go in such a machine in the UK?
Using roads for take-off & landing would be prohibited of course. Although I seem to remember Gary Newman scaring a few motorists some years ago.
A UK county is doing well to have one decent airstrip. There are fewer now than before the 1930's. That means so much ground driving as to make it all pointless.
Then there is the problem of UK weather which means that the only way to create reliable transport is with full instrument capabilities. Jumping in your aircar and pootling off on a short, foggy autumn day will need a Cat IIIc strip with ground manoevering radar at the other end !!!!!
Actually the technical difficulties are the very least of the problems.