Yeah, I kind of got that (as a possible explanation) as well. I’m just not sure how that relates to seattle-relo’s situation. I never saw where they needed appreciation just to keep the house. They might be stuck there, but we don’t know they’re at risk of losing it.
Maybe he was trying to say that since the boom was so big this time that the crash will be harder. Hence, they stand to lose more money and/or it will take longer to recover.