People should understand, the way quantum dots are used today in LCDs is not the same. Current Samsung QLEDs use a blue inorganic LED backlight with random red and green QDs of a certain density. Together they all form white and pass through the normal LCD color filters....The advantage is the RGB colors are tightly focused, and creating a purer white this way is a lot brighter and efficient over white LED backlight. But the use of the LCD panel would defeat the purpose if QDs were made subpixel color filters.
QD-OLED does just that though, the QD layer is used to color specific RG subpixels, with blue passing through. But using all-blue OLED for the panel, it will be like LG OLEDs with all the advantages. But I think it's better.
For one, LG TVs use blue and yellow OLED emitters to create white, add the RGB color filters, and keep an unfiltered white as the 4th subpixel for brightness. For the same reasons a LCD QLED TV looks brighter and more saturated than a white "LED TV", it should be the case here. The white OLEDs are "dirtier" in terms of color spectrum which reduces RGB saturation, and the traditional color filters further absorb much of the light. QDs are almost entirely efficient though, and the colors are focused and pure. These will be brighter and image quality should be better with just RGB subpixels, and the added complexity of driving 4 subpixels instead of 3 means the Samsung panel should also have better processing and performance. And it's true that blue OLEDs have caused the most trouble with efficiency and lifetime, but advances have mitigated this. Using all-blue should mean more uniform aging and reduced burn-in.
I have a LG B9 and love it though, and LG should be thanked for sticking with OLED and giving us another option after SED was abandoned and plasmas were discontinued, but there's always better and it's good to have some competition. OLED still looks incredible and there's no going back for me.
MicroLED seems to be the holy grail of the future, but electroluminescent quantum dots are also being worked on, which means the QDs themselves would be the emitters and there'd be no need for the OLEDs. Panel lifetimes could possibly approach 1,000,000 hours.
Even if the panel is good for 125 years of continuous use, overall display lifetime will probably remain gated to the 5-20 year range depending on the quality of the rest of the components.