Given Japan's concerns about birth rate etc. you still think it's a good idea for kids' media to teach them that the opposite sex is like an alien species and girls are these mysterious pretty delicate things that can't fight like a boy?
Although the producer's comments are blatantly sexist I wouldn't even care so much if not for his being such a bad liar, we all know it's about toy sales!
It has ALWAYS been about toy sales, some people keep forgetting that these shows are just 50 episodes worth of toy commercials. What the producer said makes sense, color recognition of children and its effects to the mental state of the one who perceives it has been studied and applied in these shows since the very beginning. Their choice of color makes sense given that they had to project an image that a light color like yellow could not. So did the idea of having more boys than girls.
Toei doesn't give any **** about their birth rate, all they've been doing is being reactive to the current market situation. They used their themes based on what could sell more with the current population of viewers. They did try their hand out at being proactive by experimenting on their themes, but it most often that not bit them in the ass, so you can't blame them if they choose to be reactive, or somebody gets fired.
As I said way back when, if you really want to make a change in Japan's society, do something better than watch kid's TV shows and argue in an online forum.