Bitcoin as an alternative means doesn’t mean it cannot be used as payment method, it can still be used as an alternative payment method too and this the sole purpose of bitcoin. It is not a must that it will be used by all for every transaction but can be used for alternative transactions like; people use it for cross border transactions where fiat system is actually more of an hassle of changing from one fiat currency to another. Then there is the fiat which can then be used for local transactions. This is what I know about bitcoin been used as alternative for payment method.
There are very big differences in expectation of Bitcoin as an alternative to fiat currencies and a replacement to fiat currencies. Bitcoin maximalists as well as market makers usually choose right time like in a bull market and even hottest time around all time high to make such very high and unrealistic anticipation on the role of Bitcoin in the future to buy time for their distribution phase.
I am bullish on future of Bitcoin and I believe in its future but I think completely replace fiat currencies is very unrealistic hope.
As for the limited supply yes it’s certainly not widely available or spread but with the growing value of bitcoin as the price increases, Satoshi it’s sub unit is also going to increase in value too much means more supply. In fact I feel like bitcoin hoarding which I also do is actually part of the reason why we will have bitcoin bee limited
It's not new and unlike something just discovered recently because the Bitcoin total supply and its supply release schedule was programmed transparently in Bitcoin protocol, written publicly in Bitcoin wiki. People even already knew about it, usually feel more excited when they read such news that repeatedly released at the right time to hype market participants.
How is the 21M bitcoin cap defined and enforced?