I have no doubt that Crypto will become the World's currency but not right now. Not until every Country agrees with it and has some sort of standard legal tender to back it up like Gold. But we all know how that went over the years. Governments don't want Legal tender to be out in the wild, decentralized, etc. (China comes to mind). They want to control it, control money you control the people.
With the development of AI and alike, I don't think Crypto will be decentralized in the future. I think ways were being researched in how to crack the decentralization since it's first inception.
I can see a lot of rich people making money but they too can easily crash it. I think of people like Elon Musk and Jeff Bezos, Wall Street people, etc. Right now it's too volatile for me. Perhaps maybe one day Crypto will be backed by gold.