It's a catch-22. Without a government to give it recognition on a global stage the crypto-currency will never enter the global market. Bitcoin, for as awesome as it is, must go through several mediums before ending up in a chosen currency to spend it, which can get expensive at times, and isn't always cost effective (plus the lack the companies willing to accept payment in the currency). Meanwhile, at the same time, if a government recognized a crypto-currency they couldn't control as a valid means of tax acquisitions and monetary exchange the global community (aka powerful countries with the economical strength to abstain from it) could threaten to boycott it on the ground of "Protecting Ethical Principles" (because illegal purchases would be automatically taxed, but impossible to stop) which would inevitably result in political backlash and unnecessary wars (something America, England, and other other powerful countries aren't willing to risk.)

I don't see a government approved 3rd-party crypto-currency happening anytime soon, despite the porsperity it would bring to the lower casts of society, and the massive economic growth a country could beniefit from it. Like, just imagine if North Korea sponsored Bitcoin as their country's personal currency. They could become the richest country in the world in a week, or bankrupt the next after other countries bankroll a massive "fuck-you" money-loss campaign like "C: The Money of Soul and Possibility Control".

High risk. High reward. Poor people would benefit greatly, but governments might suffer. That risk is the reason why governments don't want to touch it.

Edit: Typo's and spelling mistakes fixed... I think.