It'll do amazingly well in sales for sure. The legacy of this game however, will be felt years from now when TLoU3 gets announced, because it will not have nearly the same level of interest and anticipation that TLoU2 had. With the MC score and the sales figures, this will be an incredible, but short term victory for Sony, ND and Neil. Longterm however doesn't have as healthy of an outlook for the series. TLoU2 was riding off the wave of the groundbreaking and widely beloved TLoU1. But TLoU3 will be riding off of TLoU2, which is receiving widespread hatred and rejection by gamers, streamers and youtube reviewers. Granted not everyone hates it., but it's really obvious at this point that a staggering amount of people either are disappointed, or outright dislike the story.
Will this kill the series? No, it'll still have it's fans, and it'll still have people who will buy Part 3 outta curiousity. But you're probably looking at another TLJ/TRoS situation. TLJ was a critical darling, but was very divisive. Anyone who disliked TLJ was mocked as a vocal minority, a bigot, etc etc. Then TRoS dropped and made $300 million less than TLJ. It was undeniable that film damaged the brand. The same thing will happen here. I suppose if all Neil Druckmann cares about is creating discourse and getting a fat paycheck for it, he'll be happy. It's just a shame so many people had to get hurt because of it, especially nowadays when life is so shitty as is.
The good news is there are still plenty of writers out there who don't write stories for themselves, but to bring joy to the people who experience them. In a few weeks people will get their hands on Ghosts of Tsushima, and Cyberpunk 2077 in November, and TLoU2 will become an afterthought for a lot of folk. Will TLoU2 win GOTY awards? Probably. But it'll have the same weight behind it as when Game of Thrones Season 8 won Best Drama.