There were only about 19 guys at the bottom of the list who couldn't hold the right seat on the last bid. So that would mean passover for about 19, assuming they all bid it. You have to bid it to get passover, not just have junior guys in the seat. A lot of folks in the back seat are already getting passover for a higher paying seat, the rest (other than the bottom 19) are apparently more worried about their relative seniority.

That could certainly change with hiring though, as that might induce them to jump up to a window seat. In that case, there would be plenty of openings in the back for the new hires to fill.