Historically the SCOTUS has often let issues "Ripe for a definitive ruling wait for them to get arround to picking a case they like. In the interim the "Law of the land" is totally different between two different Circuits and there is no definitive answer in the orher circuits. Eventually they act but they take their time about it.
Stay well - Stay safe - Stay armed - Yorktown
I think they are cowards, they don't like the 2 possible outcomes (civil war, or machine guns to the masses.)