It's already happening.
“ChatGPT, a version of OpenAI’s GPT-3.5 model… gained more than 100m users in its first two months, and is now estimated to produce a volume of text every 14 days that is equivalent to all the printed works of humanity.”
— Dr Thompson, Feb/2023, cited in report by the National Bureau of Economic Research (Scholes, Bernanke, MIT)
https://www.nber.org/system/files/working_papers/w30957/w309...