It depends upon what type of dark matter you're talking about. If additional samples verify that ellipticals frequently lack dark matter then that would be a serious strike against the cold dark matter scenarios. But if ellipticals lack cold dark matter then spirals probably do as well because ellipticals are thought to form from merging of spirals with dark halos in the CDM scenarios. So the evidence for baryonic dark matter I've noted would become much more relevant in explaining the flat rotation curves of spiral galaxies because w/o CDM, baryonic is what you have left.