I gotta say I love these calculations. hats down !
but there are 2 points that might play a big role in affecting the predictions.
1- the S11/S15/T15 .
these machines run about 40% to 70% more efficient than the S9s. indeed they will not make a 70% change in the calculation but soon enough tons of them will be up and running.
2- I have some good contacts with some bulk asic suppliers in China mainland, there are S9s by the tons that have been shut down, packed and waiting for a buyer. they are selling as low as 125$ with PSU ! .
one of the suppliers i know sold well over 7000*s9s a few days ago "Free On Board". ! which makes me think , somebody somewhere who is not in china have access to cheaper power and is about to start plugging back those S9s !.
now of course this could be a group of stupid rich kids who just heard about mining and are entering a business that will make 0 profit for them as many others do. but the scrary part of point 2 is the price ! a second hand s9 with PSU for 125$ is tempting! it can attract many investors to buy and keep the difficulty up.
again they could be buying them only because they are cheap and they waiting for a bounce in BTC price to start mining, but what are the odds than anybody would do this?
I know 7000 s9s are not a big deal, but the overall second hand market for asics in china will do just fine, they will keep dropping the price until they get rid of them, regardless of whether the buyer's business plan is successful or not. many if not most of the almost 1 million s9s that have been shut down can possibility return to service.
I do hope i am wrong and whatever thoughts i am having now are nothing but the result of eating to much lamb earlier.