I agree with you fiat money can never be destroy or gone forever it has been there eversince,we are not all educated to have the knowledge in how to use crypto money,yeah true it helps us a lot but we have respect the value of our oldest money.

Well, fiat money is given out by financial institutions that are big in size and are backed by the government. They make their earnings by charging fees for transactions and they will do everything to stay competitive. So I don't think that fiat money will be gone completely in the near future.