Well, there is the new "Li-Fi" internet, that is based on light. It's much faster than Wi-Fi, but requires a direct line of sight. So if you could build a system of mirrors in space that can deflect that light from one planet to another, then you would have internet that can travel long distances at the speed of light. Then you can use bitcoin from anywhere.

Well yeah, considering the fact that bitcoin's price will keep rising, and quite exponentially, then eventually it will be more and more annoying counting all the decimal places, which is fine, but unnecessary. So satoshi seems like a solution that will eventually be necessary, at least for most people.