When I look through those Wikipedia talk pages what always strikes me is that it is as if a whole raft of not-so-smart people have finally found something they can be experts on. These then use their own developed lingo and the fact that they have more time and expertise about WP than their usually smarter and better informed subject expert counter party to bludgeon them with all kinds of mumbo-jimbo to the point of abandoning the issue altogether. The really sad thing is that this still produces an encylopedia that is better than anything that you could have paid money for.
I think it has been discussed a few times that Wikipedia is a place where various kinds of zealots, fanatics, and obsessives can go and play a variant of the game of Diplomacy. This tends to drive away normal people who have subject matter knowledge, but are not interested in investing their time in long political campaigns over Wikipedia rules and power struggles.
It seems this happens in many places where the opportunity presents itself. StackOverflow seems to suffer from a similar (not identical) issue.