It isn't just a speculative attack on the USD but also every other currency. The collateral against Billions of valuation of bonds and equities will be in Bitcoin. Fiat system collapse because they are debased. From that perspective an attack on the system is built into the fiat cake. If it not Bitcoin then something else.

The fascinating part is for the first time in history there is opportunity for a smooth(er) transition. The fiat system can just fade slowly away.