It's possible that mega-threads are a symptom of a busy forum. In other words, the real problem may be the level of traffic rather than the use or non-use of mega-threads to organize posts. High traffic brings many difficult problems.
I don't believe that TB has any authority to speak on this issue, but I always like to hear new ideas on how to increase the value of FT to our members. In particular, if you know of other websites that handle high traffic levels in clever ways that you feel add value to their readers, please share that information here.