That's a bit unfair. You can actually buy a flying car today. A few companies recently got their vehicle fully certified and are doing commercial sales. It's not cheap. If you can't afford a second Ferrari don't bother.
The future is already here, it's just not evenly distributed.
https://www.pal-v.com/ is one for example. Certified for road and air. You need a pilot license and a driving license. And it needs a short runway to take off or land. €499,000 excluding tax.