I'll bet BTC will still be alive a century from now, while centralized coins such as XRP and BNB will fade away into oblivion. The future is unpredictable, so anything's possible.
Why don't you think they can coexist, play roles and be used in different use cases in the modern financial system?
I know many people hate XRP and altcoins because they are centralized, but if we are realistic and accept the truth. This world is centralized, centralized services will survive and not only that, we depend on them to survive. So there is no need to avoid or badmouth them all the time.
XRP and many altcoins like AVAX, SOL, LINK are providing a lot of practical applications for the financial and banking sector. So, contrary to you, I don't think they will disappear anytime soon, they will become more and more ingrained and play an important role in the modern financial system.
Bitcoin and all other cryptocurrencies will coexist, and they will play different important roles in the future economy.