For now, Bitcoin is really huge value and many people used it nowadays that's why bitcoin continuously rising every day, and its big potential to be a next strongest currency in the world, because of the unique value of it.
If we talk about being the strongest currency in the world from market value point of view, then bitcoin is no doubt the strongest currency as it is having a very high market value. However, till the time bitcoin will not be recognized officially, it will not be possible for bitcoin to be the strongest currency in the world. The role of government does carry a very significance importance in this regard.