Thanks to all for your replies. Some of them have made me a bit more optimistic about the future of GPU mining.
I would not believe the information from this forum. It is flooded with noobs that have no idea about mining.
At this current time ETH allocates for over 77% of emission to GPU miners. Once it will go POS all GPU miners around the world will have 77% less profits altogether.
Miners with a lot of knowledge will probably be able to find new coins, but miners that use whattomine, nicehash and other "default" mining strategies will be defensless.
Just my 2c.
There will always be a second choice mate, once upon a time bitcoin was the most profitable coin to mine and Ethereum took over when bitcoin because extremely hard to mine without super hardwares, Raven coin is pretty close you know, let's wait and see how things will go once Ethereum fully goes proof of staking