My wife is college educated and native Korean, so these are just my observations of her and her friend group's engagement with Chinese characters (Hanja).
Hanja, in daily life, has largely disappeared from colloquial Korean for those under 40 or so. It's still preserved in some formal settings like medicine and law, and is used to appeal to older generations. I've been with my wife long enough to remember when Hanja was still very common to see on newspapers.
There are some small vestigial problem with eliminating from daily life, the large number of monosyllabic Chinese-origin loan words in modern Korean can sometime create ambiguity when written in Hangul. Native Korean speakers will sometimes disambiguate these words by referring to the Hanja, but that's largely disappearing as a habit as well.
Younger Korean generations still learn it in K-12, but it's mostly wasted class time in an already overly crammed education. The kids who focus on it are really geared towards becoming lawyers, and certain kinds of doctors (mostly traditional medicine). STEM focused kids will focus on English instead. As a result there's an active linguistic process occurring where English loan words are slowly replacing Chinese-origin words and concepts in active and modern Korean.
I don't too much about Japanese, but I do have a sense from native speakers that writing the same words in the four major writing systems offers some sense of nuance to how close a reader might be to a concept, or how they might consider it in various ways. From visits there, I did notice the expectation that native speakers could seamlessly read and jump between the systems, often within the same sentence. But I also understand that the pronunciation of Kanji is somewhat nonstandard, and it's not immediately clear how to say something written purely in Kanji (sometimes this is supported by providing explanatory superscripts in another system next to the Kanji). Why persist with this? I suppose it's the nuance that's being conveyed, and this nuance is still prized among native Japanese speakers.
I do get the sense that China has no particular plans on moving away from the system, as it's a unifying source of national identity (and has been for centuries). And they really have very few other options. The main problem is that China is a highly linguistically diverse country, and Chinese offers the ability to transmit ideas instead of sounds which allows speakers of non-mutually-intelligible "dialects" to communicate. Moving to a Latinate system or even to Zhuyin Fuhao (Bopomofo) encodes sounds, not ideas, and risks fracturing the state. It would only become possible if there was a concerted effort, maybe over a couple generations, to Mandarinize and discourage the use of local dialects, but that would also be highly disruptive. Koreans, Japanese (and other adjacent non-Sino languages like Vietnamese, etc.) escaped this either through a higher level of linguistic uniformity, or strong efforts to standardize or teach a national dialect that the writing system (Hangul, Chữ Quốc ngữ, Hiragana, etc.) could amplify.
Hanja, in daily life, has largely disappeared from colloquial Korean for those under 40 or so. It's still preserved in some formal settings like medicine and law, and is used to appeal to older generations. I've been with my wife long enough to remember when Hanja was still very common to see on newspapers.
There are some small vestigial problem with eliminating from daily life, the large number of monosyllabic Chinese-origin loan words in modern Korean can sometime create ambiguity when written in Hangul. Native Korean speakers will sometimes disambiguate these words by referring to the Hanja, but that's largely disappearing as a habit as well.
Younger Korean generations still learn it in K-12, but it's mostly wasted class time in an already overly crammed education. The kids who focus on it are really geared towards becoming lawyers, and certain kinds of doctors (mostly traditional medicine). STEM focused kids will focus on English instead. As a result there's an active linguistic process occurring where English loan words are slowly replacing Chinese-origin words and concepts in active and modern Korean.
I don't too much about Japanese, but I do have a sense from native speakers that writing the same words in the four major writing systems offers some sense of nuance to how close a reader might be to a concept, or how they might consider it in various ways. From visits there, I did notice the expectation that native speakers could seamlessly read and jump between the systems, often within the same sentence. But I also understand that the pronunciation of Kanji is somewhat nonstandard, and it's not immediately clear how to say something written purely in Kanji (sometimes this is supported by providing explanatory superscripts in another system next to the Kanji). Why persist with this? I suppose it's the nuance that's being conveyed, and this nuance is still prized among native Japanese speakers.
I do get the sense that China has no particular plans on moving away from the system, as it's a unifying source of national identity (and has been for centuries). And they really have very few other options. The main problem is that China is a highly linguistically diverse country, and Chinese offers the ability to transmit ideas instead of sounds which allows speakers of non-mutually-intelligible "dialects" to communicate. Moving to a Latinate system or even to Zhuyin Fuhao (Bopomofo) encodes sounds, not ideas, and risks fracturing the state. It would only become possible if there was a concerted effort, maybe over a couple generations, to Mandarinize and discourage the use of local dialects, but that would also be highly disruptive. Koreans, Japanese (and other adjacent non-Sino languages like Vietnamese, etc.) escaped this either through a higher level of linguistic uniformity, or strong efforts to standardize or teach a national dialect that the writing system (Hangul, Chữ Quốc ngữ, Hiragana, etc.) could amplify.