I can’t help but think of that saying “the market can stay irrational longer than you can stay solvent.” Yes, prices in many markets are very high and appreciating at a rapid clip, but if there are buyers, competition, and houses are continuing to move quickly, then it’s a bold statement to say they are overvalued and that we should predict a significant decline.
A lot of people buying houses unfortunately don't really look at aggregate home ownership cost and focus (incorrectly) on monthly payments. So, because they can afford the monthly payment, they think they can afford the house. This of course works works until the music stops.