The opinion did not specify May/Shall.
Thus setting up the next great battle. The prohibitionists will want to pass may-issue laws like New York and California where issue can be denied for any reason, and applicants must prove that they are shot at almost daily to stand a prayer of getting a license. The ISRA and their cohorts will want shall-issue with minimal prerequisites.
It'll be interesting to watch the fireworks and see who ultimately wins. Pass the popcorn!
Violence is an ugly thing, but not the ugliest of things. The decayed and degraded state of moral and valorous feeling which believes that nothing is worth violence is much worse. Those who have nothing for which they are willing to fight; nothing they care about more than their own personal safety; are miserable creatures who have no chance of being free, unless made and kept so by the exertions of those better than themselves. Gary L. Griffiths, Chief Instructor, Advanced Force Tactics, Inc. (Paraphrasing John Stuart Mill)