There is already studies that confirm your fear, I think. They found that mainstream language is changing due to AI. Certain words get used proportionally more than before, etc. Also, if you check out some reddits, it's crazy how generic many things are. Because of AI. I do agree wholeheartedly that we need to read more. And also, that AI can also be a very cool tool for giving some people more power in a way.
Reddit is like 99% AI bots writing fake human-looking threads
The em dash in particular is being used a lot more thanks to AI. It’s become one of those tells where people start to ask if it’s AI or not.