It started showing some form of burn in for 2016 LG TV model during 2018. But as far as I can tell burn in are still only seen within very minority of users. ( Otherwise you would have read about it on the news ) So if you are not picky, OLED is the way to go. 2017 and 2018, as well as 2019 models all have improved in longevity, and so will the Top Emission WOLED coming in 2020 / 2021, but it will take some more time to test before being sure of it.
Given the price of WOLED panel fall below the price of LCD panel, there will be a price point of OLED tv where it is well worth to buy one even if it might fail in 4 - 5 years time. And that price point will be different for everyone, some consider $1200 55" were good to go, some wait for $1000, some will only buy one for $800.
But if you intend your TV to last for 10 years, then I suggest you wait a little longer.
Given the price of WOLED panel fall below the price of LCD panel, there will be a price point of OLED tv where it is well worth to buy one even if it might fail in 4 - 5 years time. And that price point will be different for everyone, some consider $1200 55" were good to go, some wait for $1000, some will only buy one for $800.
But if you intend your TV to last for 10 years, then I suggest you wait a little longer.