If something like that happens, then you will need to use your fiat currency or gold or any other precious metals. I don't even think about this scenario. It's too far away, if ever.
Absolutely agree. This scenario, i think it wouldn't happen. Nowadays all people can't live without internet. Even for Bitcoin, can't survive if internet goes down either. I can't imagine it.
There are a lot of companies who are running internet and because of that there is no reason for internet to come down so cryptocurrencies will still live a long life and those who invest on bitcoins will be wealthy in the future.