Imagine being the seller and accepting the 2,826 Bitcoin offer for your house and 40 days later at closing, the "value" of Bitcoin has dropped 50% AGAIN. I guess you would be out of half of value of your house. It will be shock for seller. I would hope that both the buyer and the seller would be smart enough to base the transaction on a real currency and then agree to settle at the Bitcoin (temporary) exchange rate on the day of closing.
Well if you have a terrible Real Estate agent/attorney who doesn't write that contingency into the contract, then yes it would suck. But if a person has a brain they would register conditions in the contract