People say this but it's kind of the opposite, which is why the casuals/outsiders are getting impatient and the knowledgeable fans who pay attention to prospects and development are less stressed.
Yzerman has refrained from splashy, big-name trades or UFA signings, in general. Prospects are given time in europe, juniors or AHL. While signing Chiarot, Holl, Copp and acquiring Petry may seem like "rebuild-ending moves" to some, in reality they are placeholders exactly because Yzerman doesn't want to rush the rebuild by promoting prospects who aren't ready or spending major futures to acquire short-term help.