I think the ProgPOW alone would be enough to revive GPU mining. The price right now sets break-even for people with 10 cent power costs which is the average. I remember when ETH temporarily was at $160 last week and the profits were already looking a little better.

If we get ProgPOW actually and soon then it would level the playing field with ASICs and we might see some decent profits again. And then if you HODL the ETH coins you might finish the year at a great profit level.

However the way that the ETH dev team takes their time with all the updates and delays, we might not see ProgPOW until the end of the year.