I still don't understand statements like the ones above. If everyone is focused on exchanging with fiat, then how can BTC anything more than a commodity? Sure, countries and import/exporters need to look at global currency and exchange rates, but many people within countries trade only their currency without exchanging.

Isn't the strength of the currency based on its inherent value? Won't the value increase if it can be used to trade products/services?

Just some ideas; I'm not an expert on currencies.