If you say no then my question, how could be XRP a hundred billion coin become 3$ when its actual high could be maximum 0.50$.

I don't understand this question... can you rephrase it?

I have no doubt there's a lot of manipulation in the market. A lot of exchanges have to direct the market to clear their books.

But you started with the point that crypto can't replace fiat. Maybe that's true, but nothing you've said really supports that point, because there's so much manipulation in fiat currency, as well as basically every market on Earth. So why do you think that crypto can't replace fiat?