Well, I am very happy to report that Qantas opened up D inventory for me for QF108 (which was showing J9C0D0 and now shows J8C0D0). Lost my seat assignment (they say the seat map is closed because they've reached 80% assignments), but I am not really worried about that.

The BA/Comair flight is still waitlisted, but that's not as big of a deal right now.

Thanks everyone for your input.