China has been using its pictographic orthography for thousands of years. If it wasn’t a problem before the 15th century, I don’t see why it would be after.
Aside from government standardization attempts, language evolves spontaneously to meet the needs of everyday people, scholars, etc. Westerners tend to think, “How can they possibly learn such abstruse-looking characters?” But if individual Chinese people were thinking the same thing, they would have started writing in shorthand, leading to an ever-simpler language. Every language is simple and complex along different dimensions, but in total I think they are all about as difficult as each other. Mind you, that doesn’t mean they will be of equal difficulty for the native English speaker!
As an example of varying simplicity along different axes, to master Chinese I hear you need to know about 5,000-6,000 characters. To master Japanese, you need about 3,000 (you need to know 1,500 inside and out, and be able to read another 1,000-2,000), plus less than 100 simple alphabet-like characters called kana. So the Chinese writing system is twice as hard as Japanese’s, right?
Not at all. The vast majority of Chinese characters only have one possible pronunciation (in a given dialect), they are all one syllable, and not many of them are exact homophones. A single Japanese kanji, on the other hand, can have up to 12 different common pronunciations (in the case of the extremely common kanji 生), and for any given syllabic sound there could be up to around 80 common characters that can be pronounced that way. For instance, there are at least 60 common characters that are all pronounced KOU (all exactly the same!) in certain normal usage situations.
In addition, a single Japanese character in some situations could have one syllable, and in other situations it could have up to five or six: 志 (ambition) is variously pronounced shi or kokorozashi depending on the situation. Because of that, Chinese kanji are relatively easy to learn. One syllable, one pronunciation, and not many homophones. In Japanese the homophones can reach ridiculous proportions: 貴社の記者が汽車で帰社しました(kisha no kisha ga kisha de kisha shimasita) means “Your reporter returned to your office by train” and is actually intelligible to a Japanese native in the right situation.
Chinese (especially the traditional orthography before the simplification a few years ago) is high on the “crazy jumbles of lines” factor, but low on the “acres of homophones” and “how in blazes do I pronounce this!?” factor. English has its own daunting and seemingly pointless complications for learners from entirely unrelated language groups, as I’m sure some here can attest. The 13 or so different vowel sounds versus only 5 in Japanese, or the boatload of tenses, persons, cases, differentiation of singular and plural, etc. that one has to keep meticulous track of in long sentences.
To restate my main point, languages are spontaneously evolved tools for communication. Provided there has a need to communicate ideas efficiently in the history of a culture, the language should reflect that. And even if I am somehow mistaken and there are any languages deficient in that arena, Chinese would be one of my very last guesses as to which it might be.
Since Japanese is my specialty and not Chinese, here’s the guy from the videos in the other thread (Khatzumoto):
English translation: “The art of war is of vital importance to the State. It is a matter of life and death, a road either to safety or to ruin. Hence it is a subject of inquiry which can on no account be neglected.”
Two points of note: 1) Look at how much more succinct the Chinese is, even taking total number of strokes into account. 2) Although I don’t speak or read Chinese, I can more or less get the gist of that because all those characters are also used in Japanese,* which by the way is in a completely distinct language family from Chinese. This gives a clue to how many different languages and dialects the singular Chinese writing system united: Mandarin, Cantonese, Hakka, Wu, Xiang, etc. Even Korean uses a few of those nifty pictograms.
*Here’s a translation in old-style Japanese, which is a little more succinct than modern J: 兵とは国の大事。死生の地、存亡の道、察せざるべからざる。