This is actually why as a homeowner, I'm not particularly bothered by the value of my house dropping.
Don't get me wrong, it's not exactly fun to watch its price tag drop, but the supposed dollar value of the house isn't "real" unless I'm looking to sell, which I'm not going to be doing unless I'm changing living arrangements, whether that be buying a different house or renting. Its value to me is that it's 1) a home and 2) a semi-fixed cost that won't ever be dramatically changing rather than increasing several percent each year.
One problem with the value dropping (assuming you're still paying off the mortgage): lenders can freak out and call the entire mortgage due and foreclose on your home. They did this extensively after the subprime mortgage issue.
Don't get me wrong, it's not exactly fun to watch its price tag drop, but the supposed dollar value of the house isn't "real" unless I'm looking to sell, which I'm not going to be doing unless I'm changing living arrangements, whether that be buying a different house or renting. Its value to me is that it's 1) a home and 2) a semi-fixed cost that won't ever be dramatically changing rather than increasing several percent each year.