There are some real short-term issues. Teachers who don't know anything about it. Students who think the teacher won't notice that their illiterate self got smart over the weekend. Legislators using it as a political football.
But ultimately before long text AI will be good enough to fool anyone. And you will be able to feed it your style and it will spit out text appropriate for your grade level, just good enough for the A. And cheating will happen.
Pandora's box is not going to be closed.
Does that spell universal illiteracy and the end of higher learning? lol. Nah. Testing will certainly have to be creative.
Just off the top of my head. Have every student write one paragraph during a whole period and make it as good as they can. That creates a baseline. And, you could actually use an AI (or not) to measure future results against it and map growth.
We will figure this out and AI, at least for a time, will be a good thing. Quantum Computer AI that can predict the future... not quite as excited about that one. heh.