You might be interested in this since I saw that you have written on this subject before. This is the RFIE received after withdrawing the I-864. My question is what good will a joint sponsor be if she no longer has the husband upon which the I-485 is based? If she did get a joint sponsor, I am sure this case would be set for an interview, and I would not show up, so the whole thing from this point forward is a waste of time for everybody. But this theoretically allows the whole thing to drag on for 87 more days until formal denial.