Probably not - that would mean that countries would have to give up control of their currency to an independent entity. As it stands now, economies are pretty much independently controlled and one way for a government to control their economy is through manipulation of their currency - something they will not give up. There is also the law enforcement problem in that using bitcoin is a perfect way to launder cash.

No country has approved this. How can it be a Prime Currency ?

Yes.

I don't see it, most of us don't have any or know where to get any or see any reason to want any.

not likely