The world wont be destroyed if it's a worthless world... What would be the point in that? I haven't a doubt, seeing how our species has developed, there are other species with far greater development. We've living on the edge of our galaxy and we're just getting started. We have the edge but don't know how to use it. We've recently changed, evolved when we entered the machine age. There are indications throughout religious text that that moment would occur. But it is a frightful time to imagine thousands of years ago, so the way it would manifest itself I believe is the result of what we have today. No colossal mind blowing event... the mind blower is knowing exactly where we stand. All the worlds are one... we are moving toward that point.