There are 164 national currencies in the world. The USD is the defaco world currency and the USD is not worth infinite of other currencies and the rest are certainty not worthless.

I think the US government tolerates crypocurrencies because realistically they are far more damaging to countries like Venezula and China who have much more restrictive economies and in those countries the flexibility of bitcoin is a huge advantage.

How many aircraft carries does bitcoin have? 0. Which (in my opinion) happens to be the exact same chance of bitcoin usurping the USD as a global currency short of some fundamental change in world power.