(I do think some amount of Hanja education helps learning more Korean words, but using them in everyday documents is another matter.)
Some newspapers banished Hanja entirely in 1988, when many old-generation scholars decried the sorry state of Hanja education and the impending downfall of the Korean culture.
That didn't happen, and one by one, those newspapers that ran the op-eds of worried scholars followed suit, a process hastened by the introduction of the internet. (Writing Chinese characters with a keyboard isn't really an easy process. Especially when you're speaking Korean: you type Korean first and then have to convert each word to Chinese, so why bother?)
Nowadays, Korean culture is just as strong as before, Korean dramas are popular in China, and many official documents are arguably much easier to understand than in the 80s, partly thanks to the efforts to banish esoteric jargons that nobody could understand without writing in Hanja (and only poorly understood even when written in Hanja: think about it, you can't understand what a telephone is even if you know the Ancient Greek words for "far" and "voice". You could only have a vague guess.)
On top of that, many of these "esoteric jargons" were direct import from written Japanese words during the colonization period, so they were never a proper Korean word outside a small group of people.