How come the Mariners don't fire the head honcho, Jack armstrong?

every year it seems that the mariners always have the same excuse, ohh the m's are rebuilding, why is this? and how come players that don't do good here are let go and then they play good for another team? i like the sports teams here but if the m's don't start playing better they can leave just like the sonics did!! your thoughts, , please?