Bitcoin adoption is inevitable, like fighting against the win. To put it better, like to Borg said- "Resistance is futile". It's not that Bitcoin is imposing but rather it offers a better, clear alternative to the inflationary status quo.
As time goes on, Bitcoin will also become mass adopted, if it can't become legal tender, at least it will be accepted as a commodity, or asset, but with the order of acceptance will be a series of regulations.
The government will never fully accept bitcoin if they don't figure out how to control it, accepting it without any regulations is like shooting yourself in the foot, and the best way is to regulate the people who trade bitcoins.
I guess bitcoin is already accepted as a commodity or asset because many exchanges are allowed to include bitcoin and altcoins on their trading lists.
It is only a matter of time for bitcoin and altcoins to be accepted as legal tender even though some countries already accept bitcoin as legal tender.
Apart from being a means of payment, bitcoin also offers investment for people who want to increase the amount of money by buying bitcoins and altcoins and storing them and selling them at the highest price.
Governments may not be able to control the movement of bitcoins but they can monitor bitcoin users through their banks so they will know the transactions used by users.