In 20 years, people will either be saying Remember when you could buy bitcoin for only 3500? or Remember when everyone lost their minds and spent millions on useless internet money?
One day cryptos might boom in such a way that basically everyone who didn't invest in them will become poor
I accept the first part of the conversation that the price will move higher with more investment coming into bitcoin and with time we will reach a point where the price will be stable and it will take a long time, but that does not mean that the price would be a million dollars per coin and the rest of the people who invested in something else will end up in a loosing position, i am not sure what theory you are talking about, with zero investment the end result is null and not negative

.