Well, I sincerly hope the boards stay open. This seems to be a natural gathering place. I mean 'net-junkies' will know were to find other boards to discuss the game, but newbies will look at the box or manual and got to the official sites. And comparing LA and OE's forums we certainly have a clear winner.
Also, when any developer maintains open lines of communication with the fans, whether through own boards, usenet, fansites or whatever it speaks volumes as to the developer's intentions (Derek Smart excluded).
If it takes increased moderation to keep the forums open, then by all means do increase moderation. Those who don't have anything better to do than troll, do not deserve any better.
So please, do NOT close these forums.