I think it is somewhat possible. I wrote an article about it:
How To Live A Simple Life Out Of A Backpack
The thing is, that I don't think it is reasonable or even sane to think that one could live completely free from society, but they most certainly could become a minimalist and not have to rely on society in any way, shape, or form. They could be completely independent, I think, but there will always be a clash of civilizations, so one would have to "look like" they were still apart of said society.
I have been kicking around this idea for a long long time.