What would happen if someone, lets say Bob. Goes out and says "We got a problem. Previous governments have been doing too much QE. Inflation is going wild. We will now adopt Bitcoin as legal tender."
Would Bob get elected? Or would majority of people not like Bob?
Since btc and usd are competing against each other, a pro-btc president would mean an anti-USD president. Since the USD is the default currency of the United States, you can't expect the president to be anti-USD. This would be considered treason probably. Everybody likes crypto but let's don't be silly. It is not going to happen.