I used to subscribe to that theory, the Zero-Point Timeline Theory of Flinstonian Chronology... which also explains why in earlier 1960's versions of The Flintstones they have giant birds that act as telephones yet in 1980's versions they have comparatively tiny rock-based cordless phones. It also explains why The Flintstones were middle-aged in the 1960' and then suddenly "Flintstone Kids" by the end of the 1980's. It's not an apocalyptic future - Time is somehow flowing in reverse for the Flintstones!