A recess appt. this weekend would be nice. Let the dems chew on that for a while.
Given that the Senate refuses to even vote on the Bolton nomination, I think such an appointment would be entirely appropriate and that the President should do so.
Unless of course the President is using the obstructionism to his own advantage in other ways. Personally I think the refusal to invoke cloture should be the trigger that sets off the nuclear (aka Constitutional, aka Byrd) option for *all* Presidential appointments, including judicial ones.