The way science seems to work is major breakthroughs in understanding could have unknown applications in the future. For example, time dilation as predicted by Einstein has lead our GPS devices to more precisely know our location. It is hard to say how knowing what applications could come from having a better understanding of dark matter. The discoveries today could lead to something huge years down the road. Maybe it is the key to help us avoid an asteroid collision or a new method for harnessing energy.