You think there will be a technically limit how fast to solve the SHA 256 function. Dont believe so.
It's not a technical limit it's a physical limit.
Then there is the investment cost per amount of work done, this while decreasing during the previous years can't go to zero.
You can't have a 100 times faster computer that costs 100 times less, not in this life.
What I have learned in my years here in Crypto: As beginner I thought Hashrate and price has a function. But it has not because people speculate (see point 3)
Indeed it has.
The price of coins dictates the daily reward for miners, if the price goes down so does the reward, at one point miners will turn unprofitable and switch off. It's not the case now, even as we speak with this decline in prices you're still making profits with lower than 8c/kwh electricity, for an s19 is around and nobody mines with those prices.
Besides, there is a lot of gear on order that will be plugged in so things will evolve in different directions for a while because of a delay, but in the end, it will still keep the balance, even if the price would go to 300 million tomorrow there is simply no gear available to put in to match that rise, it will take years for it to be manufactured.
I dont believe POS makes more centralisation. You can run it with Pools same POW and when you get 4% ROI a year, the rich get not as far richer then with investing in estates.
POS comes with centralization.
The ones that have enough coins to stake will get more coins, the ones that afford to leave tons of money on stake without touching them are the ones who will get more coins to get more % in staking share. Simple as that!
Imagine voting based on the value of your assets, where Musk has 100 billion votes and 30 millions have zero since they only have debts.