The SCOTUS isn't afraid to hear a case abou the 2nd.
But 2 groups are afraid of what would happen if the SCOTUS did
1) VPC, MMM, etc. are afraid if the issue was pushed the Supreme Ct. WOULD find that the 2nd absolutely means what the pro-gun people say it does.
2) NRA, GOA, rtc. are afraid if the issue was pushed the Supreme Ct. WOULD find that the 2nd is not meant as an individual Right, ie collective Right, or that "militia" is being part of a trained, led, service ie NG, AR etc. and if an individual is not part of one of a set of defined groups, they have NO Right to firearms.
Other than those 2 groups no one is afraid of what would happen if the SCOTUS ruled on the 2nd.
Then again, a few days ago someone posted "waht would you do if they came for your AR, AK, etc. They had a poll that covered options from, hide and deny, to give 'em up, to blaze of glory.......... Not one person posted that if AW's became totally illegal they would call up the police, tell them they have an illegal weapon and DEMAND to be arrested for it, DEMAND a trial, where they would probably be found guilty, and appeal the conviction through the Courts to the SCOTUS.