The real question is: what will I be able to buy with 1BTC or 49M$? If it's not even buying me a decent house because house will be 100M$ (or anything largerly about today prices).

I mean, these silly price prediction in fiat term have no meaning at all, it's all relative.

If you tell me 100 sats buy me a burger or 1 BTC buy me a luxury apartment in Manathan, then it makes more sense, but nobody knows shit about what the market of Bitcoin, fiat and housing will be in 20 years.