But 625 miners with S19 are 2000KW at 62,5 Peta, while you need only 312 miners with S21 for the same rate at 1100KW, and that's not the s21pro numbers..
If we had had the same gear and nothing new on the horizon I would have also said something 25-30 at least, but with improvement in hash/watts, I think that it will account for the rest.
The economics are still the same, gear efficiency only affects the numbers but not the ratio, it makes 10 become 20, or 50 become 25, but it's still a 100% increase and a 50% drop, but while we are at it, let's evaluate this from a different standpoint.
Let's look at the 2020 halving
Price= 10k (50% down from ATH)
total difficulty drop = - 45.6% (from 25 to 13.6) this took from 11th May to 16 July, or let's say 2 months or an average of 4 epochs.
When we climbed again to ATH in mid-November, difficulty climbed back to 21.7T, which is a 13% decrease, I would imagine the lowest difficulty drop we can ever get would be a 13% if the halving happens while
BTC price is 70k, any lower than that would contribute to more drop in hashrate.
So, I will double down on this, I see the hashrate at the end of Q2 higher than the week before the halving!
It's pretty much going to be determined by the price of BTC by then, but I would say you are most likely to be wrong, the end of Q2 is going to be 2 months and 10 days post-halving, my guess, that period will mark the lowest hashrate for this year and many years to come, it would be like July 2020 after all the dust have settled and all those mining at a loss or no good profit or the YOLO guys will understand it's actually them who need to shut down
The above theory could be further observed by looking at what happens during the halving epoch itself, we went from ATH of 23.6T to 25T, so right around the halving people were hammering the network for those last large gains before the halving, probably dozen trying solo, those planning to shutdown go full blast overclocking their gears, and then the interesting part is that it took nearly 2 months to reach that drop.
I think what explains the 2-month period to reach a new equilibrium is "hope and uncertainty", most miners would be in a dilemma, an one of three scenarios will happen to them.
1- Other people will shutdown first > difficulty will drop > I will be mining at profit again
2- Bitcoin Price will increase > I will be mining at profit again
3- I turn out to be the weakest player in the game > I will shut down
It took 2 months for the dust to settle, it could take as long or even longer this time, but it can't take forever, you may survive a month of mining at break-even or even a loss, maybe 2 months, maybe 3, but you can't keep going forever and at some point you will come to realize that others have a longer breath and it's your time to go, this is a very common psychological fact that nearly all miners have.