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This is not comparable because cash payments have a general payment structure made by most people and maybe this has mastered the payment pattern that has been so long.
Now there are some products that might offer fast payments such as credit cards, debit or qris but for cross -border payments are not proportional to the accuracy or speed with transactions using Bitcoin.
Bitcoin was created not to match anything but as an alternative, but no one knows how this concept can be imitated in terms of future payments.
Although currently it is not possible for most countries to implement bitcoin as a legal transaction tool because each country has regulations regarding transactions.
I agree about the idea that bitcoin is an alternative currency to fiat and other legal tender, but over time bitcoin may become the main currency in some countries that do not have their own currency. The real use case of bitcoin as a currency is basically not going to threaten the existing financial system, bitcoin is just an option if users need it.
I think that even if bitcoin is adopted as a legal tender, fiat transactions will still dominate. Not everyone wants to use bitcoin as a means of payment for various reasons, so only a few people will use it. I think the same thing happened in El Salvador, some people still use fiat even though bitcoin has been legalized as a legal tender.