that does not change the ultimate reality which is that if the economic majority turns against Core, it will be left in the dust.
At what point do you draw the line to stop Bitcoin from becoming
fiat by economic majority?
I do not think this will happen because the economic majority would be disincentivized to change parameters like the supply of Bitcoin for instance. The truth is that nobody really knows because there is no historical precedent, theoretically at least this is how it should work. This is the game theory and psychology that Bitcoin relies on for its continued operation after all.
If this did happen however because it is what the economic majority chooses then we can always still find refuge in an alternative cryptocurrency or a chain fork of Bitcoin. If such a change was introduced it would most likely cause a chain fork after all. Love it or hate it, this is what freedom looks like.