Central Banks adopting cryptocurrencies?

An interesting comment in one of my posts pointed out in 2025 central banks will be allowed to hold crypto on their balance sheets. I'm curious what this community thinks about and has to say about this subject. A lot of what crypto stands for is escaping from the control of central banks. So what would it mean if part of their backing assets are cryptocurrencies? Would it highly affect the value of the assets they currently own to back their financial strength? Would banks adopt current crypto projects like BTC, ETH, another project or maybe make their own coin? Would it be better for banks to own something they have no control over? Currently I've read in 2025 the cap will only be 2% of their holding, is that enough to make a large impact in their overall values, uses and utility in the economic ecosystem?