Something tells me Boomerang is gearing up to add more Flintstones content alongside the premiere of Yabba Dabba Dinosaurs. Granted, I don't think we'll be getting "Flintstones: On the Rocks", since that one is more mature in nature.
But it was clean enough to run on Cartoon Network in daytime hours. I don't think it's so bad that Boomerang can't run it.