If 1bitcoin will be like 50k or something then you need to buy a house but with the current price of 400 (more or less) you will have to gain a lot of bitcoin or wait till the price is high.
Before thinking of buying a house, lets focus on the price today, it is playing around $400+, it means we really need a bigger amount of bitcoin before thinking of buying a house... Lucky are those first adopters, I'm sure they can afford a house and lot now if they are still keeping their coins..