This was a huge subject for me as a kid LOL - I was enraged that I was not allowed to have dolls, but my cousins were because they were 'girls.' I'm all for it - why shouldn't boys have dolls? If a girl is a tom boy and plays with cars it's viewed in a very different and more positive light.
I always get the distinct impression parents will refuse their sons dolls etc because they feel it will somehow effect his lifestyle in the future, which of course, is utter nonsence. When I was a kid I wanted a little mermaid doll so badly, so when I was an adult - I bought it LOL. It was kind of cleansing for me HAHA. If I'd have had it as a kid, I probably would have grown bored with it (maybe not), but the insistance that I couldn't made me want one all the more LOL.
I don't think there should be any holds put on what a child can play with, or what he/she wants in the toy area. It's like saying pink was only created for girls. Or that God placed flowers in the ground only for women, it's society telling us what to do.
I think dolls for boys is a great idea - the problem is parents and other ppls views on it. Great idea though