Eh, Steelers fans don't really leave their team though... Their ratings, even in down times, are good. Their attendance, even in down times, is good. Hell, there was some argument to this point recently and a local sports reporter pointed out that a Steelers per-season game had higher ratings than a Pirates game that had actual consequences the same night. It is what it is here. As a Penguins fan, I learned that quickly when a regular season Pens game was getting glossed over because an off-season Steeler had a broken pinky or whatever. The Pirates were a more comical footnote till this year to most, save for those of us old enough to recall when they were good.
I think the Pirates are just basically a bandwagon thing, period, at this point then. The last time they were in the playoffs was 1992... I wasn't in high school yet. Many here have never really seen them win. Tough to fault anyone for not caring under those kinds of circumstances. Vikings and Browns fans, where ya at?
I went through lean Steelers years, and I can tell you first hand that the Steelers were still the premiere team in the city.