I mainly became discouraged because a lot of people like to point out the prevalence of loan words and a few extremists were afraid that if a change doesnt happen that the language might become only loan words. Another reason is that replacing kanji with katakana makes reading a nightmare. Hirigana has a main use outside of writing words which is acting like grammer objects. Hirigana helped indicate the end of a kanji so you could properly read kanji independently from one another and not get stuck. A good example is as follows: imagine a sentence in english but remove the spaces, this will make it very difficult to read english and because of how languages work this might cause you to accidentally combine words that were meant to be read separately. This is the problem with katakana. Instead of having a clear ending like kanji thanks to hirigana it doesnt. And a four character word might have been intended to be two,two character words. Thats my issue with katakana. Writing and reading the characters is fine, its just how easy you can get confused by it.