you are not alone and dropping in eth output is due to surge in total hashrate in the global network and doubling difficulty.
I suspect bitmain and other asic makers already mined eth w/ their large scale ASIC in house for awhile.
nvidia has 10% Q4 over Q3 revenue increase.
we know AMD financially always lags regardless of how others are prosperous in the past 40 years.
the global hashrate has increased 45% in the same period. a lot new gpus also mine other coins. asic has contributed to some of the surge under the radar.
by the time eth mining becomes less profitable, bitmain will sell asic to public to double their profit.
This is bitmain's true business model:
develop asic and mine in house at lower network hashrate. get enough profit from mining and sell old less profitable asic model to public at premium price to at least double the profit, at the same time flood the global network so the only rig can be very profitable is their own next generation high efficient in house asic model. Repeat! At the same time, they may also manipulated the coin price at bit because they have mined so much.
Will PoS kill bitmain? not really. it certainly will affect their asic business. but with $4b profit in 2017, they already developed tensor AI process in house and prepared life after asic.
After mining for awhile, I realized this: in Macro Perspective: only the large scale mining farm and people will deep pocket and power will be benefited in long run. The small fish like us will see some quick cash in the beginning, but those things will be gone regardless of whether crypto crashes or not.