A catch-22. You can only submit a new Trek idea if you're established in existing Trek. Everything else won't even be read. There are numerous "original" works that live from the popularity of existing franchises. Fanboys, Galaxy Quest, The Orville. A story "about" or a story "paying homage" to something still grabs off attention it wouldn't have received otherwise. And dilution... what exactly is dilution. I guess some said TNG, DS9 and BOY diluted the original brand. Well, officially it was then called Franchise Fatigue. Or DISCO, Picard, Lower Decks, etc. juxtaposed Abramstrek with its timelines and stories all over the place. It's about money and control. Dilution is an excuse.