flying cars or Mr. Fusion doesn't have a major financial incentive or even a humanitarian one. Those are purely convenience items, so couple that with regulation red-tape and high cost (never mind the technical aspects), and they won't happen anytime soon.. Self-driving cars on the other hand has one very big push.. the car manufactures don't loose out.. if anything they gain access to a new market segment (time shares, rentals, people who don't drive for many reasons (physical or psychological)), that gives them a vested interest in seeing this tech go live.. because the more cars on the road, the more the car manufactures can potentially make. Plus they have a almost built in obsolescence plan (hey, when it becomes required, you HAVE to buy/rent/time slice a "compatible" car).. A good well-maintained "manual" car can run almost forever (there are no requirements to upgrade its safety features if it didn't have it originally and assuming it complies to all current "road worthy" tests).. but when this comes out, you can bet you will have the same upgrading effect that the smartphone industry has.
In short, its a money game. And where there is money to be gained,, the tech will move.