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Yes, they are all technically border free, well except for the countries that have outlawed them. :)

I don't see why fiat will die. They can co-exist. Cryptos will be used internationally and for payments etc. fiat for local purchases and taxes (filling up gas, buying a house, paying salaries etc.). I do agree that Cryptos will rise rise rise way beyond where they currently are. First trillion dollars is the hardest ;)

Yeah my bad, it most certainly will not disappear, but I do believe we might see a reduced use of it in favor of cryptos. I mean, why would we not? It's safer, faster and you can have or "carry" your money anywhere, no need to worry about forgetting it at home :)

I agree, that they will co-exist. I think there will always be some type of tangible currency. Of course, it should be backed with a basket of commodities and not the current toilet paper we are forced to use.