Some say the Jetsons are the elites in a post apocalyptic world, with the Flintstones living on the surface of earth.

But there were an episode or two actually showing the surface: hobos, birds always walking (too much traffic in the sky), and no nature but only paved/cemented surfaces.

The Jetsons are indeed in the top 0.1% (the father's job is 2nd only to the owner and CEO of the biggest or 2nd biggest tech conglomerate in that universe)