DNA sequencing is a powerful technology that is still just starting to have the transformative effect it will ultimately have on biology and medicine, and other fields we probably can't even imagine yet. It is a tempting choice.
But it comes down to this. If the world's population was 12 billion or 15 billion, 20 billion?, instead of 7 billion, we might not even have most of those other technolgies that have been suggested. The struggle just to survive would have pushed aside any research that didn't apply directly to that day-to-day imperative. Safe, effective, relatively inexpensive birth control has helped limit unimaginable suffering and helped make all those other inventions possible.