While you are right that open submissions are necessary, I'm not as optimistic on getting good writers because of how the typical English BA is taught. They're not really the Shakespeare autists they used to be, but full SJWs. Writing prose is also an art form that I increasingly see people be bad at outside of ideology. When an example of non-woke novelists is Razorfist, that's a serious lack of seeds.
This problem spills over to acting too. We don't have good character actors anymore. No Andrew J Robinson, No Robert O'Reilly, no James Sloyan, etc. Actors that can melt into roles. They're either meant to be celebrities like Zendaya or overpaid extras without the gravitas.