It's a just a guess but I'm guessing that in the next 5 or so some dev is going say "we're not trying to be BG3, we're aiming to be the next BG2"
That would be the best news I could possibly get from the gaming world.
And what game would you like it to be? Another game on Infinity Engine? A carbon copy of PoE, but set on FR?
As for the topic on hand, I don't think BG3 will kill rpg as we know it, but it will try to set up a new standard im *some* areas. I believe problem lies not with the game itself, though, but how we set up our expectations after playing BG3. I experienced this issue not so long ago after finishing Red Dead Redemption 2. Rockstar set a bar so high with this game, I just couldn't help to compare any other open world with it. And even if I played many wonderful games, all of them paled in comparison with RDR2, effectively diminishing my gaming experience. That ended, when I stopped comparing other games to RDR2, and accepted the fact, that what Rockstar did, won't be seen until...they release their jest game. Suddenly, I miraculously started to enjoy other open worlds for all they had to offer, focusing on what they did great, instead of whining that Rockstar done this or that better.