This is a very romantic story. The most interesting thing about it is that something like this is very likely to happen. This is, of course, providing that the sex dolls would be less satisfactory than alive people. And that is a very big IF.
It's not that robotic dolls would become human. It's that they would be some human-like to completely fool human feelings.
Besides, what's going on nowadays between a man and a woman - the power struggle - is kind of scary.