Yes, now in Brazil you can hardly find anyone not using Pix. It is all digital and free. Even in Argentina and Paraguay, many local merchants are now accepting Pix.
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China also have a pix-like wechat Russia has a pix-like "BRICS Pay"
And those systems can be integrated.
PIX QRCode protocol already have a "currency" field, that currently only support the constant value of "BRL"
USA probably will continue to use check and printed money like the ancients do.