Just here to remind 1 sure thing......people that won in the past are those who mined in moderate way - near at loss and not who spread terahashes only when $/BTC rose.
Mining isn't done to be always a sure gain, and depending on price fluctuations (f.ex. 50-100$/btc) , expecting a scenario where big farms could be forced to slow down, is not so crazy. Of course small miners will be in same (or worste) situation, but I remind you that operative costs are much more sustainable for them than the farms.
Farms are taking a high risk, very difficult to estimate.