And that's it. I don't see the point of thinking about what would happen if what will never happen were to happen.

It was a question that made more sense in the early years, until perhaps a couple of cycles ago, but today it is clear that Bitcoin is not going to be used for small payments and that governments are tolerating it to the extent that they can control it. Add to that the number of people who use it by buying it on CEX as an investment, and not as a currency, and we will see that there is no way it will become a global reserve currency.