The only reason you can move so cheaply is because someone else is going to move into your living space. Somebody with a mortgage can’t move for $2,000 unless they can find a buyer.
This is a process that will play out over 80 years. It's not like everybody will be trying to sell tomorrow. Values for affected properties will go down slowly over time.
I'm pretty skeptical of that. It seems like individual property values will hold steady, then drop suddenly once an event occurs that convinces people the property is no longer viable.