You could always disable HDR on those consoles. It's not the biggest advantage of them anyway - otherwise you might as well just stick with the existing consoles that already have HDR.I like my E6 but the Game Mode without HDR just bothers me. I know it would probably kick up input lag even more but I dont know if I should even be looking forward to PS4 Pro and Scorpio now.
And I'd take OLED + SDR gaming over LCD + HDR any day of the week. SDR looks practically HDR on OLED anyway due to the dynamic range and contrast.
Regardless, LG might release a firmware update later in the year given the demand. They already released an update to fix the HDR colour tracking.