they should keep ethereum on POW IMHO
but the point here is that even if they do that, due to the diff increasing in this stupid way, you would end up not mining anything at the end
so is not even a matter of adding more gpu at this point
I will not add any more GPU at the moment. But some cheap electricity users are adding the GPU at the moment.
the Ethereum network mining difficulty level is 51 T now. It is another all time high. These new miners are very confident.
they are not very confident, they simply can not mine anything else they are forced to stay there
they cannot simply switch to another algo and destroy it, no other coin can sustain even 1/4(probably 1/8, i didn't do the math here) of the etheruem hashrate