This is interesting Bitcoin price future forecast https://coinpriceforecast.com/bitcoin-forecast-2020-2025-2030 and it show significant growth of Bitcoin.

Although there's no assurance that it will happen but at least we see something realistic figures that Bitcoin might reach in future.

We can't be so sure if those given figures 0.5 to buy a decent home would came up, but one thing is for sure there's good chance that volume would decrease and provably in future we can buy a decent home by using 1 BTC in future.