Bitcoin is a tool, and like most tools people are only going to use them when they think they need them, we know that fiat currencies are scam and the longer you hold them the more of your wealth you will lose against inflation, but people are simply used to this process already, so we will need for the inflation to become more notorious before people begin to consider other options, and once they begin to consider their options then some assets will be at the top of that list, and we know that one of them will be bitcoin, and when that happens then the adoption will grow at an astonishing rate.
I beg to differ with your opinion on fiat currency. Fiat currency are not completely scam and you know they are their own part of role in every economy. Despite it's vulnerability to inflation, fiat currency can not be absolutely do away with. There was fiat before the Bitcoin and the duo can not be separated. You need fiat to get the Bitcoin and but you don't actually need to Bitcoin to get the fiat.