One thing that is evident in many breeds is that there are trends in style when it comes to the appearance of a breed from decade to decade. The rottweilers of the 80's to early 90's look very different than the rottweilers we are seeing these days. Part of this, I believe, has a lot to do with BYB's and breeding dogs that are not to standard. Popularity of a breed tends to drive this aspect. The other part of the equation , to me, seems to be each persons interpretation of that standard. The dogs that are winning in the ring are the ones that are bred on a large scale, hence the "Stud of the Moment" syndrome. There was a rottweiler stud dog here on the west coast that, by the owners account, was bred to some 300 b*tches in his lifetime. This one dog can be found in almost every pedigree, at least dogs here in the west. This one dog change the breed type both in a good way and in a bad way because of his frequency in the pedigrees.
In no way, do I think that a breed standard should be altered to fit the current style fads. We as responsible dog fanciers should strive to be fitting the standard not the other way around.