I don't think anyone in this thread is assigning blame for all 15 years of futility. The administration, coaches and players have all changed over the past 15 years, so other than the owner and his key chiefs, no one has been here for the whole time.
I read the OP as saying the fans and media will be looking for a fall guy for this year's failure to make the playoffs (if it happens) because the longer the streak of futility continues, the less patience there is for standing pat.