Did Satoshi ever mention anything about the taxing of Bitcoin?
I really doubt Satoshi ever saw bitcoin becoming this big, he created something with the mindset of a person of academics and he was just focusing on making something that he thought would be a lot better alternative to fiat money but in the end he wasn't expecting millions of people trading billions of dollars everyday on a trillion dollar market. That is not something you would even dream about when you are making stuff up, like when I dream about having a big house of my own I am dreaming about stuff like american suborbian tv show houses not a huge castle in UK, that would be too unrealistic.
Well, same thing happened to Satoshi, he would have expected the close circle of him that is interested in this would definitely look into it but he wouldn't even dream of something this big.
Right, of course he was a visionary but he didn't forsee his creation to grow this big after ten years so. I doubt that taxation has crossed his mind. His main goal is to create an alternative to fiat system, a technology with no central authority so obviously there should be no taxation.
However, as Bitcoin grows overtime no doubt that government is running after people which huge stash and wanted to get a piece of that pie.
Now the question boils down as how one will pay taxes or if someone is willing to do so?