Gold has been a uniform currency since time immemorial. It's relatively straightforward to judge its purity, and it has functioned superbly as both a store of value and as a medium of exchange for thousands of years. Blockchains are another solution to the issue of non-standard currencies. I could very easily envisage a world that runs on thousands of different blockchains; it's not much different to how exchanges operate now.

Ultimately, decentralization is going to lead to more freedom. Even if a fiefdom crops up that is wicked and evil, its wickedness is restricted to its borders, and everyone else around won't stand for that shit. However, robo-communism isn't going to be the way to get there.