I don't see a big deal given
- What matters the most is not the words within an utterance, but the discourse conveyed by that utterance. [Translation: how you say it matters less than what you say.]
- Word usage is prone to trends. Not just slang. Easy come, easy go.
What I am concerned however is that those chatbots babble a bloody lot. And people might be willing to accept babble a bit more, due to exposure lowering their standards. And they kind of give up looking for meaning on what others say.