One can only ignore so many motions to compel before you end up in contempt or drop your case ;-)
So far, Fitz has been responsive. He doesn't necessarily give the defense what they want, but he's been arguing his case in writing before the Court.
This motion of Libby's will go through the same process - both sides have their say, then the judge issues a ruling and order. Judge Walton did that with the Presidential Daily Briefings (PDB) request of Libby.
There are a number of lines of argument in play ...