I like the S curve hypothesis. I have something similar in mind, but it would be a little more extended towards 2050 and beyond. I don't think fiat would give up easily in just 17 years.
Discussion
The U.S. dollar was introduced as the official currency of the United States in 1785, here is a chart of why I point to 2040.
https://damus.io/note19yfgf7skdq7w0ev5u7j9qtrr0jym9e04tu2g2jt94cc70jhmjjcs9c2wgq
