I think the post of your own that you quoted, is pretty much spot-on. While I don't take my gaming seriously enough to *really* worry about not having a place to discuss my game of choice, I'm finding most forums pretty jumpy and volatile since 4E was announced, and even more-so now that it has been released.
As someone who likes 4E , and gave up on 3rd years ago, I'm not finding many forums very hospitable at the moment. Whether it's here, Necro, Paizo, whatever- most threads degenerate into some kind of BS Edition Wars at some point. I've yet to find a forum where I can just go and talk about 4E without SOMEONE coming in and telling us how X, Y, and Z in 4E suck and 3rd edition did it better. And I KNOW there are pro 4E people here on ENworld whom are just as guilty with the 4E can do no wrong diatribe.
I'd really like to see a "general forum" split so pro 4E'ers and Pro 3E'ers each have a place to talk without all the threadcrapping.
Or better yet, how about an separate Edition War forum like they had on DragonsFoot? With a slight difference- If you get personal with someone you get a permanent ban. No second chances, no 3 strikes. This way anyone who wants to debate can do so all night long without the rest of us having to be subjected to it in nearly every freaking thread!