That's true, but you are actually making my point for me. It would be smart to assume, just as a rule of thumb, that it WILL increase indefinitely,
So I should start investing in heavy lifting spacecraft businesses because it would be
smart to assume that in ten years, given your figures, we'll be at a factor 1.6e62 than now than now thus requiring us to construct a
dyson sphere in order to power bitcoin mining?
Every exponential is a logistic in disguise.
I may not have much of a clue what the future hashrate will be— but I can easily predict a few things: It won't require us to capture the complete energy output of the sun, so any continued exponential projection is wrong beyond short time frames, and it won't become significantly unprofitable against power consumption for the most efficient operators. I can speculate about what efficient means in the future, but without knowing the exchange rate isn't useful. And anything thoughts about the future exchange rate will just be guesses.