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.
I think possessing and having invested enough bitcoins and altcoins accompanied with a very progressive
market will surely grant anyone that much spending power. As long as you have the money, you can afford
to purchase anything for sale. But before all that, there's the conversion process and the exact timing to cash
out. Bitcoins would be suitable on very high dips. Maybe there will come a time when we can skip all that
conversion and simply acquire properties with crypto alone.