It would be (will be?) a good start.

But that doesn't insulate us from the global economy, which still is and will be for the foreseeable future, dependent on the global oil commodity.

Again for those who might have missed it, oil is a global economy, and price swings largely affect everybody. It would be a lengthy and expensive process for most nations to achieve petro independence... they'd have to ban most or all exports, ban all imports, create large domestic stockpiles, and also build the right kind of refineries in the right locations. All of that is expensive and politically challenging.

And that's for nations which actually have domestic reserves, like us.