If they rule that the 2nd is not an acknowledgement of a personal right the bear arms, they overturn all those cases at one time. I think that if the majority are socialist leaning, they, and other socialists in other branches, will work to see that a case that would force them to rule on the constitutional question (Ashwander et al. v Tennesee Valley Authority et al., I think) would never get to them.
We may have already seen an example of that. Ashcroft just recently changed the governments "policy" to one of individual right, which kept (I forget the case, think it was an appeals court in Louisiana I think, restraining order violation) from being appealed.