>the usual rule is that if your cabbie starts talking about it, it's time to get out of the market.
>If your cabbie understands BTC you might have a point. We aren't even close to there yet
The point is that the cabbie likely doesn't understand BTC. When an asset class becomes so popular that people who have no idea how it works are putting money into it and loudly campaigning for others to do the same that is a sign that you are in a bubble.
It doesn't necessarily mean that the bubble is about to pop. Some bubbles can last decades. See real estate in a variety of locations around the world as an example. However lot of dumb money (people who don't understand what they're buying) flowing into a thing because of fomo can be a predictor that prices are unsustainable.
