It will be interesting to see. I don't think we'll sell out over the summer like last season; I don't think the excitement of getting rid of BF will match the excitement of bringing in McNamara. The good news for Iowa is that the the home conference slate is good, and the two rivals (Wisk, Neb) are November games, which means that people are probably more likely to decide before the season they want to attend those, compared to if Northwestern were a November game.
Attendance will be very good at minimum. Iowa football Saturdays are tradition and full of fanfare. Fans are much less likely to abandon the football team based on results compared to the basketball team...