Well I can only speak to my experience, and my experience has been that manga is fairly popular among people around my age and younger, but still far from ubiquitous. I still regularly have to explain what manga is to people my age and especially those older than myself.

Regarding kpop, the fact that my phone’s keyboard doesn’t recognize the word and the fact that I’ve never heard a kpop song on the radio much less any sort of radio station dedicated to it I feel kinda demonstrates that it’s still pretty far from mainstream.