With its nuanced characters, wonderfully layered world, and incredible depth of interactions, it was natural to feel the game had set a new bar for the whole genre—but it was pointed out that declaring it the new standard was unreasonable and unsustainable given how few other developers could possibly rise to meet it.
You could make a game a third of the size of BG3, and it would still be excellent value for BG3's asking price. And no, you shouldn't attempt to make a competitor with BG3 on your first try. Nor should you try to make a competitor to Elden Ring on your first try; FromSoft had been making those games for the better part of 15 years, building and iterating on what came before. I do think more RPG developers should strive to follow the systems-driven approach that Larian has and be cognizant of what it is that we all like about BG3, but it can be sustainable if you don't try to hit a home run on the first pitch.