We not gonna pay with BTC but with stable coins like USDT...
That is never going to happen in a million years.
Centralized altcoins like USDT will be immediately removed from existence by United States if they were used for payment instead of USD simply because they would be printing US dollar which is considered a threat to US and that threat will be eliminated immediately by the government. Since they are centralized, it is a very easy thing to do.
Additionally if people wanted digital dollar, they are already using digital dollar using their digital wallets, paypal, credit cards,.... there is no reason to use a centralized super risky shitcoin.
There are no current exist cryptocurrencies that could replace USD as a global payment, and if there is someday i'm sure it's hard to replace it because the power of the people who controlled the paper fiat money is too strong, they already ruled this world for many generations so i think it's quite imposibble to create an environment where everything is paid by cryptocurrency.