I am old enough to remember when OLED was in the same boat. Yield was low, expected life was short and RGB was far off.

I was extremely excited when I got my hands on a 2 line character single color OLED display many years ago. That a phone would ever have an OLED color display was a far off fantasy.

I am sure we will see uLED at some point, it just takes time and a lot of research.