What do we think of a time that may come when the fate of human survival will depend only on using cryptocurrency for buying and selling, because mankind may soon find Fiat currency is obsolete or of no value in their current environment perhaps due to world earth crisis or pandemic or war .
Your opinion is valid!
It's not impossible. Coming from rocks, and seashells, to metals, precious metals, now with coins and fiat money. Cryptos are even called nowadays as 'smart money' so, there is a possibility that in the future many are heavily reliant to crypto for purchases. But, I don't think that most of the countries are going to let go with their currencies, they might go digital wholly but that's still going to be reliant to the government's standard and not with crypto nor Bitcoin. However, we're starting to see the impact that Bitcoin is doing in the fintech.
Trading them is never going to be essential for survival. But mode of transactions from fiat to complete crypto is possible in far future. By that time most of the economic systems would have been made such that crypto would be regularly used by everyone. It would never be a drastic change but small changes over the years and not something to worry about right now.
Do not forget that in bare minimal survival, internet is not going to work, so crypto will not work either and fiat or lesser than fiat modes of transaction would gain priority NOT bitcoin.
For now just focus on accumulating more and more crypto.
The possibility of crypto as a must for day to day operations? . As for the impact of Bitcoin, it is extreme. However, the cryptos will be there but wouldn't be for all. Just as it is now
That future seems so far and invisible (that's total dominance of crypto over the fiat currency).
Coming from rock till now? I guess the nterfaces are still there and would still be (no matter how little) from one condition to another.