but even bitcoin is governed by a set of rules
Right, but as you admitted in your previous post, the rules are unchangeable, at least by a central authority. Which, IMO, is a great thing.
Are you for a single global currency?
If it was something like Bitcoin, then yes. But I don't necessarily think it should be the only currency. I like the idea of currency competition. If Bitcoin is preferable to government backed currencies, then people will naturally move to it, otherwise they will avoid it. The question then becomes one of whether or not the central bankers and governments will allow for that kind of currency competition because...
...if Bitcoin is truly a preferable currency, then it would jeopardize the central banking system.
It's the impossible trinity. The problem that all countries have with banking. You Chose what the US has, which is the most logical, IMO.
Here's a 80 second explanation
I watched the video, and it makes total sense to me, but I was left with only one thought:
It's still an artificially created problem due to the existence of nation states. So calling it "impossible" is a bit misleading, IMO. "Impossible in the current worldwide political paradigm trinity" is more accurate, but not as catchy.