The promised 25,000 mini LEDs turned out to be less than 1000 zones, and even then the controller was horribly laggy and poorly implemented giving a far worse experience than a properly implemented ~40 zone tv. And it costs more.
Micro led would be interesting where every pixel is it's own led, without pixel burnin like oleds suffer from, but that seems far off if ever practical.
Oled seems like it will remain king for a while.