Forgive me, checkwriter, but I wonder if one sentence in a review by Alastair Macaulay is going to have much influence over young dancers with body image issues, since they clearly acquired those issues from other, more immediate, sources. (In addition, a lot of the younger people of my acquaintance seem ignorant of where the news they read comes from, surely those more responsible for the fuss are those using the Internet to attack the guy, thus spreading his unhealthy message that slim is better to some who probably would never otherwise seek out Macaulay's reviews.)
I do forgive you, Dirac. If you have been spared the ordeal of having to deal with serious weight and body-image issues on a first-hand basis, then consider yourself blessed. As you correctly suggest, influences come at dancers from all angles and all sources. While Macaulay's one sentence in his review is just another straw, it was not a sentence that needed to be written in the way it was written.
As for the backlash - I think that's helping. While it may have spread his comments far beyond his original audience, the fact that most of the backlash appears to be on the side of the dancers sends a far more positive signal than what his one sentence did in his review.