The first week of the show's airing was a battlefield on /fog/, between actual fans of Fallout and normalfags/Bethesda fans/paid shills. After that, you could tell that everybody involved stopped caring about it, aside from content creators who creamed themselves at how much of a good product it is and how lore friendly it is and how they can't wait for Season 2. On /fog/, this show only got mentioned later when lore spergery comes around, and there is a few people there left that genuinely get angry when it and Fallout 76 are laughed as fanfiction.
That's really the only legacy this show will have to me and I can't see Season 2 changing that. If anything, inclusion of Vegas will make people go back to playing the actual game, and be shocked at how different it is compared to Bethesda slop.
Remember how when the TV show aired, Fallout 4 had this awful update that broke all the mods and exposed tens of thousands of people to incompetency of Bethesda? I see this happening again, except for the eternal argument of "is New Vegas better than Fallout 3/4?". There is only so many times the LGBT friendly Bethesda fans can call it "Fallout Troon Vegas" before they have to face facts that their favorite games are either not RPGs, or barely count as such, not to mention all the other flaws their games have. Now imagine a new wave of normals having to face those facts, too.