If you look closely at the curves for the 1980 amd 1990 “bubbles”, you’ll notice that the upward side of the line is steeper and the downward side is more gradual.

This 2006 bubble has been steep on the downhill side, but I’m wondering if, now that it is down to a “normal” bubble size, if the downward side might become more gradual, too.

If my theory is correct, that would put the bottom even further out than 2013. Just a thought.