That s a "little" problem we don't know when these future oled tv come ( may be with no much better firmware even it is webos3.5 ! )
i wonder myself if I have to wait because beovision 7 55 full hd have a very pretty picture ( it is full led local dimming zone 512 ) and today for 4K tv we have not much movie,in France no 4K provider on satellite and for Netflix in 4K you need fiber ..( not to much area have it .. my town is not deserve in fiber nowdays !!) so ... and "en plus " the beovision ( horizon,avant or 14) have not so much beautiful picture and instable firmware ...
you are right for a main screen if you are objective there is no need to change ...emotionally for a second screen why not ?
if the review by user show that firmware is more stable and mature i will see
thanks