There are all kinds of good ideas out there, both episodic and story-driven, wacky and serious, for all demographics, but the problem is studios only hire from one stagnant pool of artists.
They gotta have enough disposable income to go to college, the idealism to pursue art, and a locality to southern California where the industry is (or a willingness to relocate to it.) That's why Calarts is as big as it is; it's in the back yard of the major studios, and people from Calarts hire other Calarts grads. As a result you end up with 5000 of the same person, an upper class liberal who's never had a hard day in their life and wants to tell stories about genderfluid queerplatonic pals going on dramatic, fanfic-like coming of age stories in a world vaguely parodying 2000s anime, harry potter, or whatever else they liked as a kid.
If you gave someone who never had a chance the kind of money and resources to pitch a cartoon, you'd come up with some insane shit. A mechanic from Ohio could pitch you Primal, a teacher in Minnesota could make the next Sesame Street, weebs all over the nation have the potential to make a cartoon at least half as good as any of those short-lived sports anime like Yuri on Ice or Free!, but none of them have the money and privilege to even think about getting into the industry, let alone the attitude/politics to tolerate their potential coworkers.
