Fiat currency is decreasing in value while Bitcoin is increasing in value.
In other words, Bitcoin is deflationary and fiat is inflationary.
So, the Bitcoin you save today will be worth exponentially more tomorrow, while the money you save today will be worth less tomorrow.
So is your point this will continue until people are forced to spend BTC because fiat currency will have no value?
Bitcoin is only worth exponentially more tomorrow as long as people believe it is. Most currencies are mainly backed by trust, and that is not something that is earned over a market rally. Let's not forget what happened last April.