Yeah, but in your example, I use an other example: if businesses are willing to accept canabis (idea) as a payment method, does government need to deal with it? No, they can choose what is legal or not.
Most governments don't trust bitcoin, but apply tax on them. You can't play on two side board, and without properly answer from government, bitcoin is a legal global currency. Government can regulate bitcoins with tax and prohibition, but they can't totally kill.