I had the exact same thoughts about this remand with no precise timeline. Such a decision is certainly frustrating the intent of Congress, who wanted to provide a way to get a stalled application moving if the Service is not doing their job. By sending back to them without specifically instructing them how and under what timeline to proceed, the whole lawsuit is like Shakespeare's play: Much ado about nothing.
On the other hand, care should be taken that the 'specific instructions' should not contain a deadline only for USICS to adjudicate the application; if FBI is left out of the judge's order, USCIS can deny the application at the end of the 'grace period', arguing that they can't approve an application without the completed name check and because they are bound by the court order, the only option left for them is to deny the application. Rather, the prayer for relief should ask the judge to order:
1. USCIS should immediately ask FBI to expedite the name check (if they didn't do already);
2. FBI should complete the name check as soon as possible but not later than XX days after the order;
3. USCIS should adjudicate the application as soon as possible but not later than YY days after receiving from FBI the result of the name check;
4. If the decision is to grant the application, USCIS should schedule the oath ceremony as soon as possible but not later than ZZ days after adjudicating the application.
(I put XX=30, YY=15, ZZ=15, rather optimistic
)