I say it's because of the gameplay most people want to play atm. What do the biggest franchises all involve as a game play hook? Shooting/killing something in one form or another. It's pretty much across the board for major AAA games (and even non AAA these are the games that generally sell the most in the west). That type of game play doesn't really work with for an all ages story for the most part. I mean are you going to have a story about a child finding a new bond with a parent or pet that also involves killing/shooting things? (Last guardian is one example that does fit but it's not really cartoon per say)
What kind of gameplay hook are you going to have the player do in a more cartoon/younger themed story in a 3d world? It can't really be focused on killing if your wanting a pixar/Disney style themed game. The only gameplay styles that would work, puzzles, platformers, collectathon adventure style, etc just dont have a big enough market to truly ever be abe to justify a AAA budget.
I guess you can argue that something like argue Lion King game or The Jungle Book could be written in a way to retain the family friendly story and still have a gameplay hook most woukd enjoy (killing things), but I think those would only really sell because they are known IPs, a game like that, even with a huge AAA budget I just don't think woukd garner the sales to justify the budget.
What kind of gameplay hook are you going to have the player do in a more cartoon/younger themed story in a 3d world? It can't really be focused on killing if your wanting a pixar/Disney style themed game. The only gameplay styles that would work, puzzles, platformers, collectathon adventure style, etc just dont have a big enough market to truly ever be abe to justify a AAA budget.
I guess you can argue that something like argue Lion King game or The Jungle Book could be written in a way to retain the family friendly story and still have a gameplay hook most woukd enjoy (killing things), but I think those would only really sell because they are known IPs, a game like that, even with a huge AAA budget I just don't think woukd garner the sales to justify the budget.