You are quite right to watch Europe closely. Specialy UK, oil and gas is over the peak there right now.
But I think you forget the most important alternative; it wil be coal, coal and coal. It is what made Europe big and it will be used again.

We will see a whole new (new?) social lower class: coal mine workers, mark my words.

What coal? Coal has totally depleted in France and Belgium, almost totally in the UK, production has peaked in every European country long ago - in the UK already 1913. A lot of remaining coal (in Germany and Greece, for instance) is really lignite. Donbass coal in Ukraine peaked in the '70s and the have to dig as deep as over 1000 meters, as in Germany. This is very expensive and makes the possible production increases very slow and costly.