As far as I can tell, the problem isn't that Lego is making a pink and purple set and marketing it to girls, but that they're marketing only this set to girls. Basically, they're acting like there's a difference between "people lego" and "girl lego", and that this is a natural difference that they discovered through years of researchery.

Maybe this will draw girls more into Lego. That would be awesome. *moment of childhood Lego nostalgia* But in my opinion, the pink and purple stuff should have been inserted into/marketed as part of the existing Lego world, diversifying that world to include more feminine stuff that does indeed appeal to lots of girls. Now it seems like they're creating a separate girl enclave, and that's just totally unnecessary.