The downside of fiat currency is printing. Then what is the process of forking crypto? Currency cannot be the limiter for the market.
Back to politics.. Trump cannot have the cake and eat it.
Let's look back to history. After WW2, USD replaced GBP as the reserved currency. It was because Britain was no longer a superpower. A hands off approach and asking for security payment and still wanting the USD as reserved currency is a tough act. Then again, a ballooning deficit of >$30T is not sustainable.