I think if you are going to survive a SHTF, you have to be somewhat isolated. In my mind the biggest problem in survival (once you have food, water, shelter, energy and communications) is the hoards of unprepared people streaming out of big cities who what to share your resources with you. Or maybe just take them.
So prepping in the Hollywood Hills is not going to work. At some distance from a big city, it will work, but that distance depends on a bunch of factors.
If you live on a mountain top---and I did for a long time, you don't need others besides your family. With a chain saw, you can cut and fell trees into the road, chop them up into a kind of maze and you have a road block/check point to repel unwanted people.
It sounds to me like there are some people here that could survive for decades with their setups.