If crypto goes to a tiny fraction of a cent then I will buy all of it. Since I will never sell it for zero then it can never go to zero.
Example: We imposed strict sanctions to Russia that almost cut any trade with them. Is the Russian currency valued at 0? Of course not. Because Europeans, Indians, Chinese are buying Russian currency to pay for Russian natural gas / oil.
https://www.npr.org/sections/money/2022/04/05/1090920442/how...
If you got rid of the government, the value of the currency might still go to zero, while the intrinsic value of the resources could still be worth something paid in another currency.
If there was no Russian government and army then you would just go in and take whatever resources you like at the cost of maybe a couple of bullets.
Transaction costs are not a factor in the worth of the asset.