very simple answers.
-snip-
I thought the simple answer would be short, but it's not.
Once thing is clear for me. Once ETH goes PoS , there will be no more coins profitable to mine in the hole market and GPU mining will die.
I stopped to mine ETH from early 2017. Why people always measured GPUs mining profitability using ETH? Is it related to coin prices? (value and stability)
GPUs more flexible than other mining devices, I got more profit mine another coins, e.g., in the last few months, CLO giving me profit more than the best time of ETH mining, and also other coins that I've mined (I can't write here one by one). Even when it is short-time profit, but we can move to other coins after.
Seem like I agree with this:
I've been here since '13 and I have been seeing the same thing being repeated here. Let me tell you: GPUs will never become obsolete. hey will always find their place to mine coins where FPGAs and the ASICs can't reach.
As I said before.
In fact, a lot of GPUs miners still exist and still getting enough profit, although it depends on how experienced that miners and where s/he lives (related to the cost of electricity) and may some other thing.