I personaly thing there is bigger chance that oled will just break sooner than some burn in will kick in. The consumer electronics is nowdays not made to last 5+ years and I think most of the people will just replace the TV sooner than they notice any burn in.I'm up to 1793 hours power on time on mine for work and play. 0 burn-in.
Many of these people will replace flagship phone every year but they are affraid to buy a TV for same money because of burn in.