It's a great way to divert anything into an identity/privilege discussion.
I mean, the biggest boost it got was the debate over Lena Dunham's Girls and its lack of non-white characters. That's been rumbling on for 8 months or so, with the ire directed at Dunham, not examining why you don't get a lot of non-white writers/directors getting shows on television.
The Hulk puts it quite nicely...
http://badassdigest.com/2012/04/18/film-crit-hulk-smash-hulk-vs.-the-girls-criticism/
Now that's a stand up and knock it down one - television as a whole's got a problem with representation.
But it's the ability to be able to take an element of discussion, one not vital to the main point, and use intersectionality as a tool to widen the debate until it loses all structure and integrity. The question's a hard one for writers and artists to address without seeming exclusive. "Why doesn't your work include x group, of which you are not a member and exert privilege over" - "Because it doesn't, and addressing that group wasn't my point" - Well, your point is invalid unless you can include x group" - "Well go fuck yourself then".
Which goes back to Suzanne Moore's New Statesman article, which is not about wanting the body of a Brazilian transsexual - but is about feminism providing a platform for solidarity against the cuts. But the way the discussion got diverted into two words - that's a bit worrying.
What could have been bloggers, writers, journalists discussing how to better work together against a very real threat to society, is instead a discussion about privilege, identity and intention. About people inside and outside of the commentariat discussing what was meant by certain words, used in a certain context. How some people are no longer credible.
And the thing that poses the threat rumbles on, unabated.
Intersectionality is one hell of a weapon if you want to shut down, divert, dilute and de-orientate debate, discussion and action.