You can wait your whole life for new tech , I don't think that oled gaming monitors will come this or even next year. The next big thing is direct led, which we have since some years @ televisions.
So once we see OLED gaming monitors whether 16:9 or ultrawide 21:9 , we'll see them at 60HZ and that may be by 2020 . And we'll wait another 2 years to see them with high refresh rates + G-sync / freesync .
And another 2 years to see them with HDR +1000 nits . So for Gaming 4:2:2 will be enough whether with 4K 144HZ or 3444 X 1440 200HZ . I hope single cable DP1.4 will be enough to do 200HZ + HDR + 3440 X 1440 + G-sync + FALD 512 zones with 4:2:2 without having to set lower refresh rate to get 4:2:2 .