If things ever fell completely apart and there was a total breakdown in civilazation I would not want to have to depend solely upon a 357 rifle pistol combo for my survival. As I said in my last post I think it is a great combo for working around the farm and going for walk abouts.
In a total break down I would have caches stashed all over my AO. My primary side arm would be either a 1911 or a 357 mag and my rifle would be the M1A or an AR in 5.56 and they would accompany me everywhere. I would keep the RUMs at the house because from there I have a good vantage point and can take full advantage of the RUM's extended range to protect the only ingress to the place.
Relying on only one weapons system in times of trouble will be a huge mistake, unless you plan to acquire more as you go along and are skilled enough to do so with out getting killed. I have been in fire fights up close and personal and it isn't very fun. It is much nicer to have them at several hundred yards away and the .357 doesn't have enough of a maximum effective range to be considered a good defensive weapon in a total break down of society where you could be confronted by roving gangs, and you will need the ability to engage multiple targets at a distance, and there again the 357 just won't cut it.
Best wishes
Joe