Then how do you know that Bitcoin and ETH will have zero value by 2025? what is your basis? Your evidence must be strong on this matter.
"Peter Schiff said so"
But anyway, banks refusing transactions is their problem, not an underlying fault in the cryptocurrency, because they are only blocking funds coming from an exchange (which ironically is also hacked by a bank). P2P exchanges can not be blocked because it looks like a normal send/receive money transaction.