Ben needs to stick to arguing that changing all four wheels is better than just doing two. Which is obviously true.
Whether one is prepared to accept the compromise inherent in doing only the front two, and adjust one's driving accordingly, is to a large extent an individual choice. Just having the front ones changed is obviously likely to cause the rear end to become unstable if you brake too hard or corner too fast.
The idea that there's any case at all to be made for doing the rear wheels only is still batcrap insane, any way you slice it. Give it up, Ben.
Rolfe.