They can schedule whatever they want. I have never had less than 8 hours behind the door (except when I was very new and didn't know any better). If the kickoffs get delayed enough they eventually get the message that the pilot group will not fly fatigued with inadequate rest, and alter schedules accordingly. They only schedule reduced rest because they get away with it. The FAR's are specific about flying fatigued, you do what you need to in order to be legal and safe.