It's more complicated than, "using AI more and more will cause us to forget how to write."

It's just a tool.

I like comparing it to something like quizlet (online flash cards), which can be a great study tool, but which people will also misuse and abuse. Instead of studying and taking the online quizzes, people will often just find the right quizlet which has all of the answers to the online quiz. People who are honest will actually learn the material, and the cheaters suffer.

I think people who misuse ChatGPT will become lazier, worse writers. But using the tool in an honest way will improve even an already talented writers work.

Just my 2 cents.