Maybe we have, or soon will have, 100% of the science figured out. There will never be any more discoveries or discussions or debates regarding the physical / chemical science.
That's one of the more ridiculous statements I've read (that's saying a LOT). Historically whenever man believed he was at the end of the discovery rope, inevitably vast new horizons were about to be unfurled. No, we're nowhere near the end of the scientific discovery end of this thing.