I think it would be a beautiful initiative for the company to make but it shouldn't be forced to make this product. I would love to see a bald barbie in stores as much as I would love to see a lesbian Disney princess ;) society is trying to make everyone accepted.
My cousin and best friend suffered leukemia and was put in isolation. He was 7. I was 11. There were two 20x30cm windows through which we could see eachother. We would stand with our hands pressed together through the glass. I remember the day his hair fell out, he grabbed it in handfuls from his head and stared at it, crying.
I know that a bald barbie would have done little to help him but I can't imagine the impact it would have on young girls undergoing chemotherapy.