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.
Yes bitcoin can buy a house if the seller accept the bitcoin. But I think it is still possible if you will sell your bitcoin and tuen it into a paper money. If you have a lot of bitcoin you can save it and have to will to buy a house.
if you find it hard to find someone who sells his house with bitcoin, you can exchange your bitcoin with fiat, then you buy a house. at this time, if it's a money issue, bitcoin might do it. there is some information that I get that there is a young man who can even buy expensive expensive cars with bitcoin.