Hmmm... I'm a little torn on this suggestion. I do see the value of updating things, but I also see the value in the older style furs and eyes.
I think the collector/museum aspect of me wants to keep the older styles around so that we have some comparison with the newer furs and eyes. Sometimes it is nice to really look at an old fur or eyes and reminisce.
I also feel like KC does a pretty good job of introducing new eyes and furs into the KC line that are like updated versions of older furs and eyes. We get new genesis furs every year. That is fun! The genesis furs with the hidden/not so hidden hearts incorporated into the fur design were probably some of my favorites so far.
I think if there were to be an update in future, say to mesh objects, then your suggestion would probably be implemented due to having to update all of the textures. I love the thought of updating the kitties to all mesh, but that really seems like a Herculean task for KC. Eeeps!