well, technically the sun will go red giant well before then, at which point it will expand beyond the orbit of the earth, blowing out our atmosphere, and with it the oceans. So best-case scenario we only have 5 billion years to find a way off this rock, and realistically, our osage wood will be no good for bows several million years before that, so what will be the point of even trying any more beyond maybe 4.5 billion years from now? Until then, let's keep making shavings.