Luckily, GPU mining =/= ETH. ETH made its decision, time to get over with it.
Actually, ETH === GPU mining.
You're a legendary account and you should know by now that if and when ETH moves to POS. All those 8 million GPUs will mine the shit out of any and all those other coins you mentioned. Difficulty for the entire mining scene will increase and only the industrial miners with almost free electricity will remain.
Nah..
Real miner knows what to dig, and unfortunately ETH is not that profitable compared to other coins
AFAIK, GPU's already started out seeking other coins to mine than eth, interestingly that the difficulty right now might be an ASIC mining somewhere
added some stupid vitalik declaration not to go against ASIC for the meantime