if you buy a shirt for primary cost and then when it goes down then you have to sell it in low cost, in loss. How can it be reliable then.
I think Bitcoin's volatility has been affected or felt much in the Stock / Market and not on Physical assets like Estate. Therefore, cryptocurrency can be used as money at any given period.
You somehow try to get into trouble to ponder here about Bitcoin volatility. But thinking about it critically, you should be able to understand that the price of Bitcoin in which an estate is purchased does not really affect the physical value of the estate in the future. Because real estate will be rewarded later with either Appreciation or Depreciation based on the ongoing economic situation.