The problem it solves is that most small airports are located miles away from the communities they serve. That isn’t an issue with a car, but it does suck when traveling.

Uber/Lyft have mostly solved this problem. However. There are plenty of small rural communities or small vacation destinations which are too rural to have taxis or uber/lyft.

Is it worth it? No. But it’s a legit problem

This is more complicated than you think. The vast majority of airports in the US are tiny little things you would barely know are there unless you’re a pilot. Most don’t have rental car services. Many are in communities where even lyft/uber are not available.

The flying car thing is still pretty dumb. But it’s not as dumb as it might first sound. One of the #1 problems my family has when we fly our (very small, very old) plane on trips is how to get from the airport to anyplace reasonable.

Woah woah woah. Not even close to true. The only things you can fly without a license is a single seat ultralight, paramotor, and similar things that most people would barely think of as a plane. There are very specific and restrictive requirements, both on the aircraft and what you can do with it.

Anything bigger, homebuilt or not, will require a LSA license at least ans many (if not most) a full PPL.