Imo OLED has completely eclipsed CRT by now.

I don't know enough to say where CRTs could be today if they had gotten the development $ that went into other tech. But to be as good as OLEDs they would have had to find something else than phosphor as the inner coating.

For response times, CRT will always remain the king of dark-to-light response times, but afterglow for bright-to-dark would always be a factor unless a different coating was developed. OLEDs have no such issues. Subjectively, the claimed < 0.1 ms response times are real and there are zero artifacts, no afterglow, no ghosts, just extremely sharp and defined motion.