Politics have definitely brought this board down, imo. The politics on the old board were just too vicious; I rode with the waves for a while, but when the forums were taken down I took the opportunity to just not come back.
Really it all comes down to an individial responsbility to the collective whole kind of thing. If each person choses their right to be as vicious as they want to be, and does not exercise their responsibility to be somewhat civil and thoughtful and respect the viewpoint of others, soon no one has a board.Or at least, no one has a board worth having.
Another way of looking at it is that a board dying is the work of internet trolls. They fight like mad, using any weapons at their availility, including mockery, screaming, hate-mongering, etc, to become kings of the hill--and wind up rulers of a little trash-pile because all the thoughtful dissenting voices have just moved on.