The best time to fire a GM is after the draft, before all the scouting begins for the following year. Why fire your GM at the end of the regular season and lose all that scouting and draft preparation? Ireland is not going to be fired next week or this summer, so Ireland is VERY likely to still be in charge come draft time next year. Unless this team is something like 3-13, which we all know is not happening, Ireland is pretty much locked in as GM.
Keep this in mind, when the day does arrive that Ireland does leave, Philbin is going out the door also. A new GM is going to want his own head coach, so get ready to change head coaches again. So if you are hoping for Philbin to be a success, you better hope Ireland sticks around and does well also. Ireland and Philbin are a package deal.