You said it yourself, you need to adapt to it as well as the students. Part of that is understanding that students have access to tools like that, and so you should tailor your assignments with that in mind. If they need to be in the classroom to write an essay then so be it, that's what needs to happen. Or maybe the point of the assignment isn't writing an essay, but rather to do something with that essay, in which case it might not matter if they get it from AI, except that it might make it harder for them to work with the essay. Or maybe you ask them to write about themselves in a way that they can't BS it with AI. Like writing about an experience they had in your class, which you would know the details of. My point being, the technology is there, it's not going away, and you'll have to adapt to it. I do think it would be responsible of the AI creators to put limitations on its uses. ChatGPT won't tell me a dirty joke, so maybe it shouldn't tell you a 2000 word essay either. Maybe it doesn't, I haven't actually checked.