The solution isn't to nerf existing content, but to add additional raids that are not quite as punishing. Say they do nerf A3 and people start clearing it at an equivalent rate to Thordan EX or perhaps faster. We're right back to where we started: nothing new left to do until the next patch. Not all content needs to be cleared by everyone. If some people don't want to struggle with A3, then don't play it.
Now if they tweaked A3 to be better mechanically or did nerf it with the intent of releasing a new wall (something Mr. Happy suggested), I wouldn't mind so much.
