1 . BTC will be the primary money all over the world all the currency will be just secondary
I hope this is that easy but it is not.
The government will never allow this unless they make their own cryptocurrency that their citizens will be using that they can still track or look into. They want to control anything, so I think that is impossible.
2. All the world currency will be exchange to bitcoin slowly until its all illiminated
May happen, but I think that is a low possibility.
Why? I think a lot of people would be loving this since a lot of people usually want to do things especially new to them. As I said in the first question, the answer is the government.
3. Altcoins will be use for very country and bitcoin as its Superior
This I think is a possibility.
Bitcoin and cryptocurrency is a great thing and I doubt that every government in every country will just let this go away. If they don't want Bitcoin, then they would be making their own crytpocurrency.
I am not saying that your dream is not happening. This is just my opinion and I know that we have our own.