It seems to me if you are going to use an aluminum frame, that some type of steel insert in that area would be desirable for the longevity of the revolver.
It is weird how the problem only affects certain guns, because surely the metal is the same for all of them, and assuming people are using the same ammo in their replacements, that have not exhibited these problems, it's not ammo related. Could it be something to do with the tolerance on the gap between the cylinder and forcing cone or alignment, causing more gas pressure? It's scary how quickly it happens if you are unfortunate to get a bad one or could happen, if the one you have was to suddenly start having this issue.
It's great that Ruger are taking care of people having the problem, I'm just fascinated to know the cause -has Ruger commented to anyone as to what they think the problem is?