Just an idea: We could post them as needed based on the number of comments in the current thread. I would think ~200 would be a good threshold. We could always lower or raise the threshold later.

ETA: I see that this could be a problem for people if the thread got to say 190 and no one wanted to post for fear of getting drowned out. However, we could have a deadline for reaching the threshold, which if exceeded, would simply start a new thread. For example, if we had a deadline of one week, it would be no worse than the current OT situation, but it might be better if the threshold were crossed earlier.