There is just no way a public flying car infrastructure can be built in the US in the next 30-50 years you are alive.
Assuming appropriate sites can be found, there will also be a long permitting process to get construction approval. The latest eVTOL aircraft are quieter than conventional helicopters but still loud so anyone living and working nearby is going to complain. I'm sure they'll also raise environmental impact concerns in many areas because the noise will prevent the endangered yellow-footed salamander from laying eggs or whatever so working through the mandated mitigation process also takes years.
You might think it'll be very easy for flying cars to avoid crashing because they can just fly above and below each other, but that's also more directions for them to crash into each other from, more directions the drivers might have to rely on potentially faulty sensors where their vision is blocked. There might have to be invisible "lanes", maybe even with something like traffic lights, rather than having cars just flying every which way without external coordination.