New isn’t alway better.Sunk Cost and Sacred Cows keep the community from making the correct base.
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never be able to keep up a viable business plan for an incremental RPG that keeps up with the current trends and population and isn't shoved off into a niche corner.
Fads are often crap.
Some old ideas - whether good or not - come back as retro cool.
I’d say most of what makes D&D great is classic stuff - some of it older than RPG’s, like the concepts of make believe, playing war, elves, spells, werewolves that it brought together beautifully in inventing the concept of RPG.
Subclasses, advantage, warlocks, and goliaths are not why D&D is a cultural phenomenon unlike any other RPG. They’re just stuff someone put in 5e; perhaps improvements to editions without them, perhaps not. (Wyll the Warlock isn’t very popular in BG3, and it has no Goliaths in character creation.)
To me, arguing those “innovations“ are why D&D is the #1 RPG are like arguing the shape of the Bishop piece is why chess is successful, and saying D&D needs new editions to add stuff from Indy games is like saying Jeopardy needs to copy “The Floor is Lava”’s fonts and sound effects. I think that’s ephemera irrelevant to the success of the game as a whole.