If they had $130000 cash the house wouldn't be under in the first place though.
Additionally, a borrower who is paying on an underwater mortgage is much better than a foreclosure where the bank gets an asset worth less than you owe. Every month that you make a payment improves the bank’s position, since your payment is going to reduce the deficit between loan amount and home value.
Sorry, US banks can't issue margin calls on conforming home loans.