I'm not sure how much good it would do to fire Loomis now. It's not like you are going to hire a new GM mid-season because nobody is going to let their guys interview mid-season. It could also be that the plan is to move Loomis to another position so it would make sense to do that at the end of the season.
Or, this was just a warning shoot for Loomis that he either starts doing a better job or he is next.