I think it's important to remember when targeting retailers with a campaign like this that they generally have very few feelings on how toys are categorised; they simply want whatever sells best. If they thought a gender neutral layout would encourage people to buy more and give them more options to sell to consumers, they would do it immediately.
But it doesn't hurt retailers that if you have a boy and then a girl, this means they can sell you a whole different set of toys for the second child. Sometimes even the same ones but in different colours - blue and then pink. If you just have two boys (or two girls) the chances are that they may simply use their older siblings' toys instead. So there is a commercial advantage to gender segregation in retailing to some extent too which would need to be overcome.
Retailers do affect people's views with their marketing, so it is 100% right to get them onside with this campaign. But they also reflect society and the people who shop there. I meet various retailers mentioned on this thread through work. They tell me that there has been an enormous rise in demand for "pink and sparkly" from their customer research and they aim to meet this demand. (Don't shoot me, I'm just the messenger.) Given the commercial position I mentioned above, retailers are happy to provide anything that may sell to their customers.
So while changing marketing gendered toys may help stop people feeling that boys and girls need separate toys, it is a bit of a chicken and egg situation. There is also pressure on retailers from parents who do like gendered toys to continue this. My niece, as mentioned before, for example, only wears pink and has pink toys. Her mother actively said before birth that she wanted a girl rather than a boy and encourages the whole thing as she thinks it is fun, not at all sexist.
Er, not sure about the point of this post. I personally hate gender marketing as I detailed in my previous post. So I like the idea of a campaign; I just think it is a complex issue to deal with when so many people also enjoy gender separate marketing......