I sometimes feel that sentences written as you speak are not easier to read than those written in other ways. In addition to that, in the case of the Japanese language, the ending of each sentence tends to become very monotonous with "desu" or "masu." I suppose that "Write as you speak" is not always a good recommendation. I wonder if these things apply to other languages.
"If we are not cautious about the way English is progressing it may eventually kill most other languages." (Claude Hagege)
The above is from "The death of language?". I think that the point is the relationship between the English language and the other languages.
I feel that my native language, Japanese, is falling into decline in some academic areas as a written language. The English language, as a spoken and written language, might also be falling into decline by its diffusion across the world.