Of course I’m not a lawyer. If I were I’d be charging you for my pearls / pellets of wisdom.
I’m thinking buyers who claim they were misled about deficiency judgments, impact on credit rating, tax liability for debt forgiveness, and so on.
And under the right circumstances, perhaps homeowners who will claim some technical violation of the laws surrounding distress sales, and seek to rescind the sale. Of course that wouldn’t make sense unless there were a massive rebound in home prices within two years … and even if that happened I’m not sure it would make much legal sense.