"Untrustworthy governments manipulating currencies" appears to be the problem that decentralized digital currencies are supposedly solving. Instead of this indirection, how about addressing the root problem? Replacing that untrustworthy government with a trustworthy one, changing incentives, or identifying new forms of government/control.
It would probably be better to address the root problem. Unfortunately replacing governments has a long history of being a very violent and bloody ordeal.
