Come to think of it, there is definitely a chance that the government could do that. As for the reason om why they'd do that, I could not think of any yet. Still, that doesn't guarantee that they might dp that in the future because we all know that the governments all over the world are kind of secretive and we can't actually predict when will it happen.
Probably, the government will go against bitcoin due to the reason of taxes. Aside taxes from the people, the government will find a way to how to earn taxes from digital money. For now, maybe the government is eyeing for what bitcoin can do for there people and the economy.