As a current buyer in the hunt for homes down there, I can say from my perspective that, while I think the shelter-in-place concept is a good one, I am now wanting to look in neighborhoods that are outside of fire zones rather than in them and with shelter-in-place construction to compensate.
As for 4S Ranch, I can stay out of trouble from this acrimonious debate, since I have never heard of it, I think. Either way, I know nothing about that town/area? other than it is in North County somewhere, which I learned from this board.