Perhaps I’m a bit of a Pollyanna, but I’m of the opinion that we’ll never be entirely rid of the “low-hanging fruit”, as it were. How many thousands of years had people seen those rocks, yet never understood the geological implications of them? Who can say that, a hundred years from now, someone who knows “what to look for” will find something in the mundane that will counter modern understandings of some currently accepted theory? We may understand more than humanity ever has, but there is still so much out there.