It does until mining rewards go to zero right? unless there is a closed ecosystem whereby miners can pay their electricity bills and other expenses with crypto. Eventually actual money has to enter? Just sort of thinking out loud maybe missing something

At some point the crypto ecosystem hits the real economy and miners need to pay for power and datacenter space with real currency.

A lot of the people employed in the crypto space are also out there buying houses, cars, taking vacations, and buying the odd pizza. That all requires real currency.