I'm still up in their air as to whether Moller's creation is going to get legs, but you can't really compare what he's doing to a Harrier. Moller's Skycar uses fans powered by rotary engines, NOT vectored thrust from a turbofan like the Harrier does, so there's no surface blistering.
As far as the public being "too stupid" to own flying cars, they were saying much the same things about those novel playthings if the rich, the horseless carriage, when they first started rolling out. Too complicated, too expensive, and too difficult to operate for the average person, they said. Until Henry Ford came along, that is.
I contend that not only will flying cars happen, they are inevitable. In our lifetimes though? That's another story. The biggest hurdle is that the air traffic control system is set up a certain way that doesn't facilitate controlled skylanes. Training, enforcement, where to take off and land, systems to deal with IFR conditions, computer guidance, etc are all factors that need to come into play to make it happen. The FAA is the biggest hurdle to all of this, and if anything will kill the flying car for the foreseeable future, it's them.