I foresee movement in the bottom half of the list as airlines like QF are recruiting. Where you join today may end up fairly quickly up the list. It's hard to tell what will happen with new owners/management etc. Certainly the 330 going into Asia could change things in a big way.
As a new joiner I'd forget about time to FO slot on a wide body as these slots are generally filled by people with seniority equivalent of a narrow body command. Very few spots and filled by junior Captains or senior FO's.