To invent a new sort of solecism, it’s the activist version of judicial self-restraint. A court, on finding that a statute is unconstitutional, has the right to mandate to anyone but the Legislature and Governor (or Congress and the President), that action X be taken to correct the problem. For example, in the Charlotte-Mecklenburg integration bussing case, SCOTUS actually told the consolidated school board what they were going to do how and by when.
The SJC of Massachusetts and now the Supreme Court of New Jersey have taken another tack: to tell the Legislature, “Voila! A hot potato! Catch!” In other words, this law before us, we have found to violate the state constitution in these particular ways. The problem needs fixing. Rather than order the law to be enforced in accordance with the constitutional guarantee, which could be controversial, we the court direct you the legislature to identify a repair of the breach between law and constitution and adopt it at your discretion. We are staying our decision for six months to enable you to identify and adopt that fix. Seeya!
The legislature has, really, three choices: (a) adopt a civil union law, (b) amend the marriage law to permit gay marriages, or © change or amend the Constitution’s equal protection clause to allow them to forbid gay marriages. (The court decision did not specify option ©, but it’s a commonplace that when a court rules on the basis of constitutionality, an amendment to change the relevant portion of the constitution is always an option. On the Federal level, Congress has done this at least four times in response to SCOTUS decisions.
To forestall a possible objection, I don’t know New Jersey’s timetable for adopting a constitutional amendment from scratch, but it’s standard that whenever a court stays the effect of a decision to allow a party time to act to resolve the problem, and that party needs more time to complete such a resolution than was granted in the stay, the court will normally grant a motion to extend a stay.
It’s possible, too, that New Jersey law, unlike some other states’, permits the high court to issue orders to the legislature. Someone presently or formerly licensed to practice law in New Jersey would have to speak to that possibility. (Note that I have not loaded the PDF owing to a slow connection, so I cannot speak to the context of the language used in this decision.)