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.
The pathfinder games can't even break into hundreds on steam.
The last stuff on them I saw was wotr just hitting 1 miL at the start of 23. So. No they can't sell millions.
Perhaps I should have specified that when I said "Pathfinder games" I meant both of them combined. I'm aware of their sales figures. Point is, 5e is about as simple as it gets by CRPG standards. No one trying to play these games is going to get confused because certain races have certain attribute scores, even something like Skyrim has different base skill levels between the various races. I do not believe this is a change that will cause the game to sell any more than it would have previously, the "casuals" simply won't care about these types of tweaks.