Another loss for concealed-carry in California - and since the Supremes let the 9th Circuit Court’s ruling stand, it could have implications in other states.
If the Supreme Court refuses to take a case, it doesn’t mean anything. They reject hearing the vast majority of cases. They also will sometimes reject hearing a case because they believe another case will make it easier to deal with the root issues.
And in this case, conservatives on the court might have rejected it because they believe they need another judge to replace Kennedy or the Liberal Four, and thus hearing the case WOULD set a precedence they don’t want. It might make good tactical sense to wait and hope Trump gets another judge or two on the court and THEN decide it based on the Constitution instead of DNC talking points.