I'm generally pretty suspicious of so-called "diversity" in fashion, mainly because the industry is so flagrantly inauthentic when it comes to veering off the young/white/thin path. Non-conventional models are (sporadically) employed, but ultimately in the most cynical way: as a fashion statement in itself. And the self-congratulatory PR drives that invariably follow only confirm this tokenism.
Broader representation in fashion - whether it comes in the form of "plus size", women of colour, the elderly, transgender, or the disabled - will only exist in a meaningful way when no one bats an eyelid. When magazines don't pat themselves on the back for featuring women larger than a size eight or ten, for instance. Or when designers don't hatch entire PR campaigns around using senior models.
These cursory nods to the existence of humans outside the 19-year-old Caucasion ectomorph category aren't just self-serving, they're patronising. They're gestures dressed up to resemble an "embrace" of diversity, but it's a cold embrace, and it comes served with an air-kiss.
That said, I do recognise we need to start somewhere, and that a small part of my intolerance comes from impatience: i.e. the fact there is even a need for fairer representation in 2013.