Actually quite a few world governments (most notably Japan, Russia and the U.S.) are currently drawing up and enacting legislation for the regulation of bitcoin. In Japan (home of MtGox) and Russia (home of... financial fraud), regulation of bitcoin is almost essential in order to curb the massive amounts of money laundering and fraud happening in those countries.
Here in the U.S., regulators are taking their sweet time, but a Florida judge recently summed up the need for regulation quite elegantly, after a case had to be thrown out in that state against a man who was running a CC-for-bitcoin scam:
“This court is unwilling to punish a man for selling his property to another, when his actions fall under a statute that is so vaguely written that even legal professionals have difficulty finding a singular meaning.”
http://www.miamiherald.com/news/local/community/miami-dade/article146087044.html
That pretty much explains in a nutshell why governments, both federal and local, will be pushing for more crypto regulation in the future.