I kind of made this point earlier. Electro would fall into a meat processor next month and it wouldn't even be billed as a 'major death' despite his character having a lot of longevity, he's just not that popular on his own. You could argue changing his race at least gives him a layer of interest that wasn't there before, but still I think, by and large, unless it somehow makes more sense (like MCD's size and presence greatly outweighed the color of his skin in the casting choice -- Kingpin HAS to be an imposing mass of muscle) there is really no sense in doing it.