Well most of the people in the oil biz reckon the North Sea is about half way done.With new technology then they might be able to extract even more.
I'm old enough (just) to remember ABZ before oil,and it was a bit like Wick.One Viscount a day.
Beyond oil,well it will just go back to what it used to be.A bog with coos, tatties and neeps.A weel (sigh).Or a wind farm,cos there won't be any oil left.