Buyer contracted to buy Seller's house for $290,000; the contract included a representation by Buyer "that he has sufficient cash available to complete this purchase." Buyer was a physician who practiced with his uncle. He had received assurances from his uncle of a loan of $200,000 in order to finance the purchase. Shortly after the contract was executed, the uncle was examined by a cardiologist, who found his coronary arteries to be dangerously clogged. As a result, the uncle immediately had triple bypass surgery. After the operation, he told Buyer that his economic future was now uncertain and that therefore it was impossible for him to finance the house purchase. Meanwhile, Seller, who did not know of Buyer's problem, committed herself to buy a house in another state and accepted employment there as well. Buyer was unable to close; Seller sued. Buyer raised as a defense impossibility or impracticability of performance.
Is the defense good? Explain.