All is of course subject to Jin’s agreeability and his time constraints.
I did not have a feeling that Curtis is proposing getting rid of anything but inactive user names/accounts.
Thinking a bit more on the subject – I would never suggest to have any reviews removed for as long as the story is on the library shelf. But, from the practical point of view (apology to Curtis and any other immaculately curious members) long deceased treads could be deleted (this would save database space!?) with the exception of FAQ and similar treads.