If you look at his emails with Epstein, it's literally Epstein asking him about his academic work, Epstein toying with various little theories and asking Chomsky about them, etc. All above board so far. Him being on the plane is not great, but it doesn't necessarily mean he's a pedo. It opens up that possibility, but there is not proof of him doing anything wrong. Yet. I really hope he didn't do anything wrong, but it's obviously a possibility.
No matter what you think about Chomsky, he's an extremely important intellectual figure and is associated with the left. Him going down would be bad for all of us - so I hope he's not a bastard.