we can make flying cars easy its just too hard to incorporate them into our society especially because a) they will be extremely expensive and b) because they are so expensive, only less then 5% of people will have them.. so why spend all the money, resources, and time incorporating a 'roadway' system for flying cars?
I mean, there has to be a system with rules you cant just let people fly cars all around
there would need to be routes in the sky (like roads) for people with flying cars to travel in, there would need to be cops with flying cars.. etc. it would just be such a massive undertaking to implement flying cars into our society that I don't think it will happen anytime soon