I agree with most of this secret and you have I right to be pissed off with where the character is heading but personally I think that even if Robin had the ability to conceive she still never would have. The episode, it seemed to me, was less about Robin wanting to have kids and more about how the average woman faces up to loss in these situations. Yes having the choice taken away from her was upsetting, but that was the entire point. As someone who has also had the choice taken away from her I thought it was a fairly accurate portrayal of what I had felt and am glad, that as subject matter rarely explored in depth, it was on my tv. In the end she felt loss, not from the fact she couldn't have kids, but because the choice had been taken away from her. Also OP, If Robin had really changed in the future to someone family orientated like you suggest then she would have adopted, instead we know she never did and believes it was the right choice.