I found this article interesting yesterday titled "Will HDR kill your oled?". The tech hasnt been mainstream long enough to say anything for certain but it was interesting to think about. I guess LG claims their oled's are good for at least 100,000 hours but that was before HDR came along. Nothing in the article would sway me from buying an oled though.
https://www.techhive.com/article/3239350/smart-tv/will-hdr-kill-your-oled-tv.amp.html