I like the way you signed your letter. "A Crazy Canadian." I think what you're proposing will not become a reality in your lifetime or mine, and probably not in your children's or grandchildren's lifetimes either. Let's take that as a given. I also think there will always be some sort of medium of exchange whenever you see trade between two or more large groups of people. Even when you have only three people in an economic system, there are documented cases in which butter cookies make a good medium of exchange and demonstrate the principle of deflation when you find out that your predecessors ate most of the butter cookies. Look up the book titled "Homesteading Space: The Skylab Story" if you don't believe me; you can find it on Google Books. An RBE might work within a small group of people if you work on the principle that, if you put something of value into the system, you also have the right to take something out that's of equal value, but you want to consider the fact that you're usually working with large groups of people who are probably going to get impatient with the idea of going through a long series of complicated trades to get what they want. Really the point of having a currency is to act as a place-holder for value that you can save up and use when you need it.
Thank you for your comments! Yes, in the far future this is what I see. Who knows though? 100, 250, 500, or more years do these thoughts, concepts, and questions apply? As I see it, those who are born on this planet will be given exactly what they need by care givers, as we typically are now. Until such a time when we reach an age of majority, we are expected to spend at least a couple of days out of our week to do something constructive for our planet's economic system. That is, the processes of production or services which may be provided which cannot be automated through programming, robotics, and cybernation. I see these systems working with a small group relative to the global population where those who live within those cities are able to come and go as they please, as transportation and shelter would be abundant within all of our cities. We either rent a free space, a free starship plus parking space, and we choose how we wish to travel through an automated process. Land and air vehicles can be completely automated processes in which they seek out jobs after dropping off a person or go and recharge at a depot scattered about the city or just on a parking space on the side of the road. When that star ship or car has to take a person somewhere, the notification would simply go to a network to pick up and bring them to that destination. That person could reserve any free space as the information technology we have currently could produce all of that necessary information and take requests for space for an agreeable, programmable amount of time.