This appears to me to be the correct course ahead. For any character that I've spent the time to fully T4 and IO out, the vast majority of the content has become trivial. To correct this, I can either self-gimp, or make no effort to improve, or IOs and incarnates can be nerfed, or more content can be added that utilizes the engine to add difficulty.
The downside to this choice is that there WILL be, as we have seen in many a thread, those complaining that the new content is far too difficult to manage with SO only builds and thus goes against the age-old "game is balanced around SOs" mindset.