The way I imagined it was, that every person will receive or will have to declare a few addresses as his own and anyone spending bitcoins or paying anyone will sort of have to declare why he is doing it. This way the government could monitor heavily. But overall, I doubt this would be successful due to all kinds of mixers and services being there.

Probably if the world becomes ready to adopt bitcoin, then a different digital currency will take its place which would have better control or monitoring by the governments.