Yet another point on which I think Yurp nailed it.
Not holding my breath about that happening stateside, of course. Conservatives want live babies so they can raise them to be dead soldiers. - George Carlin
Otherwise it will come creeping back as low cost oil depletes and the price has to rise to the point that justifies bringing more expensive oil online. I've been accused of being a Marxist, yet while Harpo's my favourite, it's Groucho I'm always quoting. Odd, that.