Agreed, in 2008 things were already going down the drain as Cat-Lady Modship was in full swing, but you could still post wrong-think and make fun of low-effort trannies. The tankie mods in D&D had to be a little circumspect in enforcing Maoist doctrine and couldn't out-right ban you for being a white and/or a class traitor - they had to put in the effort to puff up another reason, or bait you into modsass; not a lot of work, but some work.
In this environment, you're a conservative, you toxx for McCain, get banned, and see no reason to spend :thetenbux: to re-register and go deal with the triumphant crowing of said insufferables and being told by unemployed sadbrains what was and was not a good post.
Even if all the McCain posters hadn't been banned, its very unlikely that it would have stopped SA from ending up becoming the tranny hugbox it is now, populated by the kind of people it used to make fun of, but I think that the 2008 Toxx and the non-commie, non-tranny posters it drove off was the moment that decline became irreversible.
I don't really count the Romney Toxx. In 2012, making aRomney Toxx was an excuse. It was just a Banme for someone who couldn't be bothered to think up something clever. (Or didn't want to take selfies while they ate their own cum mixed with keyboard gunk.)
"Dear Richard acting like he's going to do anything (other than drink wine and pop Ambien), and then failing to follow through" is pretty much the condensed history of SomethingAwful.