Can you buy a house with BTC? Yes! All you need is a buyer with coins and a seller that will accept them. The value of the transaction is as of the date of the contract, when the coins change hands.
If both buyer and seller agree with to have bitcoin as a mode of payment in buying a house then why not? There are actually lots of companies who accept and agree to have bitcoin. It is just a matter of being sure on whom we transact. Buying properties through bitcoin is actually fulfilling.