I think you are dodging the issue Shamus.
The NRA has always been clear about their reading of the 2nd as an individual right. I would expect them to oppose any SC decision that went against that interpretation. They have never said the SC is the supreme arbiter of our rights. To the contrary, like Jefferson (and now the SC), they have maintained that the RKBA is an existing right of all mankind that predates the Constitution.
The ACLU, OTOH, presents itself as a defender of our Constitutional rights and has repeatedly held up the SC as the final arbiter of those rights. Now, with respect to just the 2nd Amendment, the SC is wrong and is no longer the final arbiter of those rights. You can't have it both ways. If they're going to defend ALL our rights, they have to defend the 2nd as well. To do otherwise is indeed hypocritical.