In 2007-8 there was a lot of acknowledgment of the real estate bubble but there was always somebody to say well real estate isn’t really a national market so it won’t all pop at once. Ha.
Similarly everybody knew it was a bubble in 1999. That’s why you had companies rushing to ipo like lemmings off a cliff.
Personally I don’t think we are in a bubble right now and all the early bubble callers (since 2013 or so) have no credibility left.