BTC will never replace USD. It's simply too volatile for regular transactions. ETH will never replace USD for the same reason. However, both are great long term investments.
USD will be replaced by some combination of stable coins across multiple blockchains. However, what will be the peg if not USD?
If the USD is replaced, there is no need to peg to it.
There will be something else that is the value that is pegged to.
Posted Using LeoFinance