Because of the changing methods of waging war, Ueshiba understood that all martial arts would be forgotten and/or replaced with technology and modern hand-to-hand systems, were it not for the interest of ordinary individuals. So essentially, every practitioner has the potential to be a curator of history simply by learning more about the people who created these systems and the culture that surrounded them.
This is from the article that Jun posted a link to in another recent thread. I was pleased to see someone write this. It sums up for me the reason why I'm not as interested in training sans ettiquite. Even Japanese ettiquite. I know others often look for something different, and that's ok, but I am gratefull to my teachers who provide the experience mentioned above.