At least some of those big jobs will make a stupid hire. No one bats 1.000. Hopefully IU is one of those. So there would still be good coaches around to nab.
Still, I don't think you can fire a coach like BU just because we think we would miss on other options. He's fresh off an Elite Eight and has really only had one bad season since the ship was righted (by him), and that season isn't even over yet. So I don't think he has earned getting canned and I think that may do more harm than good if other coaches view our expectations as unreasonable.
But like
@Indy Illini Fan suggested, I don't think BU has done enough to command another raise or extension yet, so if he flirts with other programs and tries to get JW to pay up, I think it would be totally the right call for JW to play hard ball. BU has no leverage for more after a season like this and trying something like that would make him look bad, not JW/us.