According to Blockchain.info, miner revenue is down from a high of more than $5 million per day, to under $1.5 million today. And that on the back of the fact that mining itself is becoming more difficult.
Don't forget mining operation isn't free and the operation and capital depreciation cost are quite high.
I suspect many miners and ASIC manufactures will disappear from the industry 6-9 months down the road. The competition and market condition just aren't that favorable.
It will be the survival of the fittest where cheap electricity provides the advantage, cold climate environment, cheap spare part and cheap living cost. Hey mining rig still needs some operator intervention and that also becomes part of overall costing.