I don't really see an issue with this. Overall my view is that the whole transgender thing is getting way out of hand, but the idea that a girl might want to play with an action man or a boy might want to play with a pink unicorn? What of it?
My only concern would be that this would be used as a blunt instrument to force parents to accept their children are transgender. I remember when I was a child there were a few of my (male) friends who played with the dolls that were more associated with girls. I had a doll for a time. I also had an action man figure that I played with, at the same time. Had I grown up in this age I'd probably have been labelled transgender (or at least genderfluid) before I was 10. I wasn't, I just wanted to play with a range of toys.