AI will accelerate “natural” change in language like anything else.
And as AI changes our environment (mentally, socially, and inevitably physically) we will change and change our language.
But what will be interesting is the rise of agent to agent communication via human languages. As that kind of communication shows up in training sets, there will be a powerful eigenvector of change we can’t predict. Other than that it’s the path of efficient communication for them, and we are likely to pick up on those changes as from any other source of change.