if at some point we are going to back to gold we need to use gold directly and go back to the old days of carrying gold in our pockets.
Gold system and generation is gone and gone for good. If gold is to be used for money, this will lead to impoverishing of the masses because gold is used as measurement of riches. Therefore it is out of the reach of masses.
Well done, the Pound has indeed been around for hundreds of years and never gone to zero. OP also ignores all the currencies in use currently that have not gone to zero. The USD has been around for over 220 years as well and depreciates slowly and intentionally and it's worked well for a long time.
I think I know that fiat can be devalued either by the government intentionally or by the economic failure in the society but to go back to zero surely means no importance, relevance of governance because fiat is the strength of government which is the reason of the struggle not to accept bitcoin and cryptocurrency because it doesn't give control to few people in government but to the masses.