1. China attacks America with nuke and vice versa and then both countries disappear
2. Hyperinflation enters US
3. Taliban overtakes Washington DC
In a nutshell, US has to fall from the position of a superpower for bitcoin to become a reserve currency. Also most other nations should not be in a position to become another superpower.
Government dislikes anything that is not controlled by them. So I don't see it happening ever!
you can actuallly forsee it coming because all these super power countries today seem preparing for war. even UK that isn't too powerful is trying to portray like they are in South China Sea. for now you can see skirmishes in Lebanon, Afganistan which Biden is once again sending troops.
if BTC becomes Digital reserves without war, then all the.series of debates about crypto bill amendment are just soap opera.