If the Pathfinder games, which are some of the most complicated RPGs on the market in terms of understanding the mechanics and intricacies of the builds, can sell millions of copies then I think people can understand 5e racial attribute scores. I sincerely doubt this change is going to sell any copies whatsoever, it may be a positive change for many people, but it's not something that is going to suddenly get them to change their mind in regards to buying the game. If they really wanted this to be a 100% positive change, they'd offer options to use the old rules, or at least change it so that humans/half elves/shield dwarfs aren't nerfed in their attribute scores.
And yet more people still play DoS 2 than Kingmaker, Wrath of the Righteous and Crown of the Magister combined. And more people have bought BG3 already than all of those games according to Steam data.
