To be honest and like I have said in one or two other topics I replied to, paying for goods at a worldwide stage is still very distant from happening.

I can see it start to happen in the next 5-10 years if the constant rate of BTC value is kept. Don't forget that the only reason why you are taking such a question is because of the hype BTC got this year caused by its sudden growth.

Until here nobody believed BTC and they are now seeing that a digital currency may possibly live in such world.

For governments to get a word on this, BTC in my opinion has still much to prove and to grow, until we start to have those worries at all.