I have no problems with these rules and the additional fee. From what I've seen these passengers knowingly choose these fairs since they are the cheapest. I believe is most cases they also board last. So by that time, there is no overhead space left. As long as I'm made aware of the rules then I can judge whether its worth it. If its not worth it, I can choose the more expensive flight, or another carrier.

That being said, I agree we need more trains. I would take the train over an airplane in a heartbeat.