Oil scarcity is not our biggest economic problem. Not even close. What scarcity there is is exacerbated by poor policy rather than dwindling reserves.
It's lurking there like a ceiling that we'll bump against each time the economy gets on track and tries to push up through. So it doesn't get noticed or given attention except by the more abstract observers who don't have a vested interest in keeping the status quo and so aren't quite so blinded by mankind's arrogance.