HELP! At My Wits End!

[Colby White]

I am attempting to workout some terms with a seller.  They want to sell, but only at the price they want. They have not been able to sell the property in years.  The problem is that the property is in too bad of condition to get the upfront, cash price that they're looking to gain.  I can understand this pain.

The property is free and clear and seems like the perfect opportunity for owner financing.  I suggest to the seller to reduce the purchase price, gain a down payment, and finance the remaining balance.  With the interest on the remaining balance, the seller actually profits way more than their initial goal price.  It's a passive, monthly cash-flow and they no longer have to worry about the property.  

The seller's fear is that a buyer will sell the property before the term is complete and simply look to payout the remaining balance before their purchase price goal is reached.

My question:  Is there something that guarantees that a buyer completes the financing full-term?  

Any advice is GREATLY appreciated.