Porners are always looking for a new angle to sell what is, after all, the same product. If some people will pony up for big butts then they can have at it. I doubt "big butt" movies are going to push your favorites out of the market, so I don't see the point of getting excited about it.
On a larger scale, there's no more uniformity regarding the appeal of big butts than there is about who's the best looking porn star. The USA is a multicultural society, so, despite what television might have lead you to believe, we don't all grow up imbibing the same standards of beauty. I don't see that as a bad thing.
BTW, dig under the Private gloss and you'll find all manner of women in European porn, as well. Maybe the fact nobody here notices it is due to the focus on Eastern European babes, not that there's anything wrong with that.
