Of course the problem with using Hubbert Linearisation to predict global oil production past the peak is that the global peak may be qualitatively different to regional peaks, precisely because societal response will be qualitatively different.

When regions peak, you can just import more oil from other regions, which is what we've been doing up until now. The result is a more or less symmetrical curve in regional production.

When global production peaks, the physical reality of oil shortage and the psychological (and therefore economic) impacts are likely to be entirely different.

We really are sailing into uncharted waters. What happens next is anyone's guess.

This is correct. A sometimes overlooked point.