Anthony DeanFrom 2018: I wrote about why "Scooby-Doo" is still popular after all these years, and is now more prominent than its studio's other flagship shows "Yogi Bear" and "The Flintstones."
https://www.diversetechgeek.com/why-scooby-doo-still-popular/
Going by older media (such as their late 80s anniversary special named after Fred Flintstone's catchphrase), I got the impression Hanna and Barbera saw Scooby-Doo as a popular money-spinner/major star (thus the 70s clones), but considered the cavemen and bear as *the* main faces of their studio?
The 90s Flintstones TV-movie "Hollyrock-a-Bye Baby" shows "Hanna-Barbarian Productions," whose main star is "Yogi the Cave Bear" (a reference to an original series episode showing Wilma and Betty watching such), not a Stone Age version of Scooby.
(Also in the useless trivia side, "cave bears" are an actual prehistoric bear species.)
Since Scooby's late 90s revival, he's become the main face of Hanna-Barbera's library. The number of movies/TV shows with non-Scooby HB characters (that aren't Adult Swim parodies) are much fewer.