Ken, at least with a ring (as compared to the quick link, cold shut, or piece of chain), the ring can be constantly rotated so the rope abrasion is distributed about the ring's circumference -- giving it durability many times longer than the link, which forces the rope abrasion to a confined area. Anyway, good suggestion about how to fix the anchor when the ring does get worn.
Another solution is to use old carabiners and replace them as they wear out. Most of us have a number laying around. We have been putting the anchor hangers that Fixe provides without the rings and putting biners in them. We were using quick links in them but threading is a little less easy. With the biners everyone is motivated to replace them when they start getting worn.
The only problem with using carabiners is that people think they're booty and take them home. There is nothing more frustrating than equipping an anchor only to find someone stole the hardware a week later.
Here is an Idea: Some one said that the Rings last a lot longer than the Links because they distribute the wear around it. So, wouldn't it be a good idea to put a ring on the end of a quick link? That way they ring can just be replaced when it gets worn. And the rings are cheaper too.
If you use a stud bolt with #2, you don't have to remove the bolt to replace the hanger. Just unscrew the nut, replace the hanger, and retighten the nut. I've upgraded a number of anchors this way, replacing Fixe single-ring anchors with double rings or lowering hooks.