No matter how much real estate falls, even if you can buy a mansion in California for at least 1 BTC, you are missing one important point.
Own a house-it is forever, along with the plot (land) and everything that grows on it.
You can say as much as you want that you don't need to invest in anything other than BTC, but the problem is that - let's admit it to each other and to ourselves - cryptocurrencies are not eternal (in the form in which they are now). And your own home will always be the most valuable thing you can buy in life.
If you try, you will be able to live in principle without money (but first you have to invest) if have your own house and land). BTC - only store/spend/trade.
And again, for fans of "doomsday" and its consequences-the house is also a great shelter (even if you dig a bunker, no one will tell you a word), as well as a great place for defense and storage of supplies.

A house is the best purchase in your life, and you can hardly argue with this in any way.