We all have dreams for bitcoin that someday we will be able to use this coin freely and no other things to think since its already accepted by the society, and the government already stop holding bitcoins neck and allow it to be use without any policy or regulations, here is my dream this is how it will be organize
1 . BTC will be the primary money all over the world all the currency will be just secondary
2. All the world currency will be exchange to bitcoin slowly until its all illiminated
3. Altcoins will be use for very country and bitcoin as its Superior
In this form bitcoin will be the global currency, no one will control it no regulations, but will penalized who wouluse it in bad intenstions
rules will only apply to it not bitcoin totally,
I have an image here this is what I submit in 10th aniversary but this will illustrate how bitcoin will dominate
the world with the man with the mask of bitcoin who represents the people, and bitcoin over in the center of the world

This image is only my representation and a goal for bitcoin in the near future
feel free to give your opinion
I think it is very unlikely that Bitcoin can become a primary currency other than the main currency in the country, this concerns the small total supply and investors who have bitcoin are full control of the price that will occur.
It would be very difficult to happen if the bitcoin policy is still like now, but if bitcoin as an alternative payment other than using the main currency I am sure it will happen in the near future.