Two things:

Once you have used it in it's basic form as savings, for a certain amount of time (I'd venture to say, for one cycle or 4 years). Then it does not seem as volatile. It may go up and down, but it never goes down past where you bought it. So it starts to seem less volatile from a savings perspective. Since many first world countries operate purely on debt and have almost completely done away with fiat savings, preferring to hold property, bonds, treasuries or stocks, they have a hard time making it 4 years before thinking of selling. They will tend to sell far before it starts to make sense and then begin to hate that they did so too early.. This is how negative sentiment happens, they will be very loud about how it will fail, hoping that someday they will be right. Bitcoin has continued on despite this, as it's fundamentals do not stop working. A Finite amount is a Finite amount.

As the block reward decreases, and the uncertainty factors of government bans, laws and regulations decrease, there will be less and less short term volatility for using it to 'live paycheck to paycheck'. Those that wish to do this now, can still do it, but they must weigh the risk of holding their own fiat currency vs. Bitcoin for a short term. Their likelyhood to do so depends on how volatile their fiat is. For the US, being top dog in fiat valuation, while still not preferred to hold it for a long term timespan, it is easy to see why people prefer US fiat for short terms where their savings balance is often touching zero being spent as it is earned. However, in countries like Turkey, Egypt, Venezuela, Argentina etc, they seem to prefer the volatility and liquidity of Bitcoin and have educated themselves quicker on the adoption curve. All the while benefiting from it automatically is a savings vehicle, for what they do set aside..

That was rather long winded, but that's how I see it. Tldr is, the US population will be one of the last to understand why Bitcoin is useful. Being part of that population myself, I know it is usually futile to attempt to explain. Meanwhile though, the same fundamentals are still valuable here if you have the patience and can afford to hold an amount through a cycle while ignoring the price.