Chatgpt is just an aggregate of how the terminally online, talk, when they have to act professional.
Chatgpt is hardcoded to not be rude (or German <-- this is a joke).
So when you say, "people will start talking like AI". They are already doing that in professional settings. They are the training data.
As someone who writes with swear words and personality. I think this era is amazing for me. Before, I was seen as rude and unprofessional. Now, I feel like I have a leg up, over all this AI slop.
Authenticity is valued now. Swearing is in vogue.