The way most bubbles end is that a decent amount of people say "this trend can't go on forever" while everyone else screams "LALALALA heard that before but the

The way most bubbles end is that a decent amount of people say "this trend can't go on forever" while everyone else screams "LALALALA heard that before but the trend is still going, hope you like being poor". No one knows EXACTLY when the trend will end - which you generally need to get right to make a lot of money. But most people with a brain know an unsustainable trend will not last forever.