For a couple years now I have thoroughly enjoyed the cross-brand discussions on Thumpers.
I own Japanese bikes from 2 different manufacturers, and aspire to have the time, space and money for a KTM. I would prefer not to read anything about BMW again in my life, but KTM and other euro enduro owners have tons of relevant info for me.
I think thumper riders generally are more apt to switch brands or own multi-brand than the old fat dudes on the touring behemoths.
I also think thumper riders are a little more likely to be grafting ktm forks onto suzukis, etc.
I do like the idea of splitting the mega-threads into their own sub-forum if it's a bandwidth issue. I nearly always enter the mega-threads via my Subscription page or Google; those threads aren't really usable in a casual reader sort of way.