be replaced in terms of what? marketcap, decentralization, trading volumes, number of transactions per second, cheaper fees, faster confirmations, technical development, price?
Bitcoin can be replaced in any of the previous pairs individually, where a currency can have a limited number and a price of 80k, or it can be replaced in terms of market capacity, or in terms of cheaper fees, or faster confirmations, but from all these aspects, Bitcoin will inevitably remain number 1.