By logic of doubling prices , In next 40 years ,BTC should cost more than 7 million USD per BTC. I just wish if it can be true.
Historically speaking that's not entirely impossible. We've gone all the way from less than $1 cents to $8k-ish now, which is 8k times. I'm not surprised if it can do the same thing again but for sure we can't rely on such prediction.
Mining needs to be profitable, so either the code changes or miners find another way to mine, like using green energy or highly efficient device.
These "logical" calculations all stop becoming rational the longer Bitcoin and its aspects become more entrenched in the natural environments. I still think that anything pre 2014 should not even be considered, certainly hashpower, price of electricity and cost to mine (or should I say, secure the network?). These calculations also fail to take into account the possibility that many more miners (or network securers I like to also say) will be in it for the security aspect, rather than for profitability.
But there's just so much going on that's changing, too much to ever say X is impossible. The way Bitcoin full nodes (Assumed let's say to at least represent some mining capacity) are no longer just concentrated in N America for example.
My head tells me million-dollar BTC is not possible but hey, I didn't think 10k was possible in 2017.