Dear Wekkel,
Thank you for taking the time to read my work. I would hope that fiat currencies do not fail, but rather gradually are superseded by superior forms of value transfer and storage, of which cryptocurrencies are a potential candidate. Failure, if sudden, could cause widespread economic hardship, which is also not ideal.
And as you have rightly pointed out, “slowly but surely,” is perhaps the best approach and will yield the most satisfactory outcome.
Yours,
Patrick Tan