i think one of the reasons bitcoin will become a global currency is the rate of acceptability . so far so far so good , alot of organizations are gradually accepting bitcoin as means of payment .
bitcoin is already a global currency, think of the following:
I am from Mozambique and I am in this forum, in this forum there are people from all countries of the world and these people use bitcoin, I may be wrong in my statistics when I say that this forum has people from all countries of the world. But I believe at least one person from every country in the world uses or has had bitcoin.
OP, governments' concern about bitcoin is not just about money laundering, Is about political issues like:
Which country created bitcoin (the person who created bitcoin is from which country)?
this is the central point of many countries' hesitation to agree to create good bitcoin laws