This contradiction must be telling us something about the nature of the dark matter distribution. It appears as though the dark matter clusters only weakly with galaxies and groups of galaxies but clusters more strongly on the larger scales of superclusters. At present, it is not clear how these apparently contradictory observations can be reconciled. Whether any of the current models of large-scale structure can describe all the observations is an open question. The field of large-scale structure is still growing rapidly from the infusion of new data, and even more ambitious surveys are now in the planning stages.
Prospects also exist for improvement in the accuracy of the distance indicators for galaxies.