Your arguments are too simplistic, naive and are ignoring the facts on the ground. Global political coordination is fucking hard and probably impossible short of alien discovery or other such existential threat. Geopolitical divisions have almost never been greater. You don't think we haven't thought of and planned for the internet shut off attack vector?

Christianity is a cult. Football is a cult. There are many belief systems. A rational mind looks beyond the cult at the heart of the thing and tests for truth and knowledge. Bitcoin is merely a consensus system. However it's also the most truthful record of account humanity has ever conceived of. That matters a great deal to our civilisation and value will flow as understanding grows.