Re world population: keep in mind that although the US is very rich, they don't have more UTXOs. For congestion only the number of transactions matter, not the amounts.

When there *is* congestion then the rich will push out the poor.

But my point is that adding a few million Americans to the pool of people-with-a-government-that-actively-hates-Bitcoin is not going to make a dent in the number of transactions.

That requires a global shift towards self custody. I'd love to see that of course.