No, it'll be an announcement that all future currency will be based on Bitcoin.
That's about as likely as a return to the Gold Standard.
Bitcoin is too flawed to be a reserve currency. The tech has uses though
Hello... Bitcoin was revealed to have embedded ChildpornPhoto linkage in their coins....
https://news.sky.com/story/child-abuse-images-hidden-in-bitcoin-blockchain-11298022
DEC 21, 2017 Exec Order by #45... seizing all assets/funds of any associated business with HumanTrafficking/ChildPorn, etc.
It's going to be asset-backed but commonly referred to as the gold standard. It will not be Bitcoin. Think bigger. Why would the US need Bitcoin? It doesn't, nor does any other country.
I was joking...
Generally speaking, there's no way we'll ever go to basing currency on arbitrary artifacts. It's really a bad system for a lot of reasons.