Not being able to cash out is the entire point of a crash. Imagine the mathematical edge case of an infinitely fast crash, BTC becoming instantly worthless. In

Not being able to cash out is the entire point of a crash. Imagine the mathematical edge case of an infinitely fast crash, BTC becoming instantly worthless. In that situation, the 4% who still own almost all of the then-worthless BTC, if they did not fail to play their cards right, will already have almost all the paper money that the 95+% gave them over the course of building their modest "bitcoin fortunes" (though much of that paper money will already be burnt on ASICs and energy). The real crash will be an approximation of that hypothetical instant crash model, with individual outcomes based on quick and correct identification of the crash and (logical and: you need both to succeed) preferred access to the last round of buyers.