Making Wyll white isn't going to make him any less of a shitty character so i don't care.
Agree, for characters with a defined character that mod doesn't change the experience at all. I think such a mod would be a nice-to-have cosmetic mod if it changes pedestrian and minor characters whose being black just throws you off from any feeling of immersion you might have. I'd happily race-swap black characters in the Last Light area (you'll reach it and you'll see). I'm not at the city yet, but I'd race swap there as well.
With the caveat that cynical old farts who have been playing games for 30 years, already need to actively put efforts into not trying to deconstruct the game they're playing. They have problems being immersed which wouldn't go away by just installing a race swap mod.
It's just my preference not to have token black characters in my medieval fantasy RPG. I don't interfere with how anyone else is playing, and I'm not advocating everyone should play this way, so live and let live.