You can also think that banks can start offering their customers bitcoin and crypto if their central banks allow it. Compare bitcoin to fiat and not bank. Also bitcoin is an alternative to fiat and not a replacement. Just know that bitcoin can not replace bank at all. Also it can not replace fiat but you can use it as alternative.
You're making sense, with Bitcoin and a secured wallet, you're your own bank so there's no need for comparism, every strong holder is already banking their money by themselves for the future and it makes much sense since there's no third party and the government or central bank has no control over what's stored in your wallet.
It think it would've been a bit tougher to the legendary Satoshi if he'd decided on wanting to replace the banking system or fiat completely, so he choose the path of an alternative thereby making a thing of choice.