Non-American here: how real and likely is this to happen?
Doesn't play a big role if you're American or not, as long as you study monetary history. This is my take:
I'm also expecting them to oppose this, because... the Federal Reserve is not controlled by the US government. The Federal Reserve is a cartel of private banks, and the US dollar is the way this cartel robs the world. A commitment to bitcoin would encourage everyone across the world to dump dollars for bitcoin, and they're absolutely not going to relinquish this enormous privilege and power they have held and exercised for centuries, because some random politician promised the people bitcoin.
However, if they do implement it, I'd expect us to go to $10 million per coin much earlier. (Yes, that's right, 100x from here, and that's just $180T. Bitcoin market cap is addressable to more than that.)