Taking into account current prices of mining equipment, electricity and labour - what is self-cost of 1 BTC for big miners? I think it is important to know, to understand the resulting market price level after the shake.
It's awfully hard to guess.
Because your have to put in equipment cost and the difficulty adjustments.
Nobody knows for real how cheap and at what discount do big miners get their rigs and nobody can predict the difficulty adjustment.
And even worse are those cases:
You bought your miner in 2016, you already have ROI on it basically your costs are just electricity.
You bought your miner (same stuff) , you have to earn back the money spent and you have to count electricity.
For ones the price of 1 BTC is a in range of hundred dollars for the others a few thousands.