Are the Flinstones us thousands of years in the future?
This theory had its beginnings in the 1987 television crossover special, The Jetsons Meet the Flintstones. In the special, Elroy built a time machine that was supposed to send him and his family into the 25th century. The machine malfunctioned, and they ended up going to Bedrock instead. What this theory suggests, however, is what if the machine actually took them to the 25th century, and what if the Flintstones is actually set in a post-apocalyptic future?
It is believed that a nuclear war occurred hundreds of years prior to the Flintstones, and that the characters from the Flintstones were all that remained of a war-torn world. It is also believed that after this catastrophic war, many people evacuated from the Earth, and built houses in the air. When the radioactive levels went down, several of these sky-ridden individuals returned to the ground to repopulate the Earth. Many animals were also presumably mutated into dinosaurs from the nuclear fallout of the war.
What should also be taken into consideration regarding this theory is the year that the show came out in. The series came out during the height of the Cold War, and because of this fact, it's not too hard to believe that perhaps a bomb from said war was dropped on what would soon become Bedrock, and that the resulting explosion blew the inhabitants back to the Stone Age.