Yeah, even if we got ion propulsion to be advanced enough it would still have thrust. It's not likely we'll have flying cars like in star wars, though perhaps we could stimulate it with stacked high temperature super conductor infrastructure combined with fusion energy for levitating vehicles but that's really just like a bunch of stacked mag lev's and not actually flying cars. By that point cars will have long been autonomous, and more like on demand Transit vehicles compared to today's cars.

Edit: I think what's more likely is for relatively low cost miniaturized fusion powered high speed orbital trans continent travel between hubs. Within a hub mass transit and autonomous vehicles will still be the solution.