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I'm not sure how fair it is to make the assumption that someone's understanding of their player's reactions is probably false just because you don't happen to agree with it. No amount of saying that's not what you're doing here changes that IMO.
I know dislike of elves is pretty common in settings I make, although not by everyone of course. But then, my thought process on these issues is largely informed by Dragonlance (as described above) and a little by Spelljammer (with the blatantly speces-ist Elven Empire).
Tanis was mistrusted and looked down upon by almost everyone who didn't know him personally, and some (like his stepfather and cousin) who did. And the elves and dwarves both had to be talked into allowing human refugees to even enter their lands, let alone settle on them. The initial reaction...
One of the things I liked about Dragonlance was that elves, dwarves, and humans were very much distrustful of each other, often to the point of violence in some cases. So it's not always just the "monster races" that get this treatment.
Fair enough all. I personally don't care if WotC makes any extra money, and I certainly don't think they need to push hard on merchandising to survive like some have implied here, but it's not all about me.
Do you get into a lot of fights? Combat in the modern genre requires that you take firearms into account. D&D is going to have combat, possibly a lot of it. Ergo, @Reynard 's idea requires that gun be accounted for.