One point I would make is... I've heard it said many times. "Fear and Greed are the 2 things that drive the markets". So I guess I would point out that when you try to suppress one or the other too much this is when the market can swing too wildly. My guess is it's probably healthy to have the conversation because if it's truly a bubble then it will be less of a bubble when it bursts. If it's truly not a bubble, then those who are invested will be fine and have nothing to worry about.