Fiat is definitely not the best store of value there is, and there are many flaws to it. And I completely respect their point of view as well because hey, at least they are not blindly falling into the fiat scheme that the government has set up, which isn't necessarily a bad thing in the short term, but in the long run will always depreciate and takes away from your wealth bit by bit through depreciation.
Fiat is actually the worst store of value that you can buy yourself into. If there is one pretty solid guarantee with fiat, then it's the fact that even after a year, the same amount of money will buy you less goods.
If you don't do anything to either keep stacking fiat, or hedge a large part of your net worth, you are basically accepting going through the process of wealth destruction. There is no other way to put it.
The average joes are programmed to think in a way that grants governments so much advantage over them, that it doesn't surprise me one single bit that we haven't seen any real progress throughout the last decades.
Whether you like it or not, fiat is here to stay probably. In which case, bitcoin will realistically only serve as an alternative, but will still be a huge role since you can always hold it to hedge against fiat.
Fiat indeed won't go anywhere, but that's all good. People should never be forced to use one specific currency. For me Bitcoin is it, but if others like to keep using fiat, they have all the freedom to do so, even if others think it's bad.