It takes some philosophy to decide how to do science. I prefer Popper's approach for the methodology.
>Or should they instead perpetually wage war against each other, at any cost?
I think we answer this question via the realization that every human is a subjective being and has a right to pursue happiness, a realization which comes from the humanities (a-hem) as much as it does from the theory of natural selection or quantum mechanics (and actually, we have no way of looking at a brain and saying it assuredly causes consciousness, so we can't even say who's a subjective being with science). Heck, the universe's "way of doing" might be a nearby gamma ray burst far harsher than any human war ;)
>You'll need a really good argument for switching to novels and philosophy for the voids of the future.
I wholeheartedly concur, but there are already concerns that if something like the multiverse is the "explanation" for the constant values in our universe, then there might be aspects of existence inaccessible to our experiments. I will need much consolation if such a thing is true.