I am not sure the OGL debacle is really a reason. There is I don't know how many thousands RPG published each years. If I do a search on kicksrarter for RPG in boardgame category I get above 6000 matches.

So tons of new RPG are being published each day, most of them are forgotten, some are good enough to drag a small but existing community, and may-be a dozen of games are big enough to provide a living revenue to their authors, while one game per decade really change the way we play (Basically D&D, Chtulhu, Vampire, Fate, Apocalypse world) so not sure there is something new under the sun.

The D&D player will keep playing D&D, the non D&D player will keep not playing it, and with the marketing power of Hasbro will keep having a long time telling beginner that there is more than just D&D or that tweaking D&D into a horror games where weak humans face cosmic error takes more work than buying COC