I definitely think that UND Football attendance will improve with the jump to Division I. UND football has great coaches, tradition and a great venue. I saw the comparison above with NDSU's numbers. SDSU made the jump at the same time and they have seen a similar increase in attendance, with the exception of 2005 when they played 8 home games. Not to dis SDSU, but they have no football tradition and an antiquated stadium and still had a great increase in attendance.
SDSU
2002 5967 (-11.4%)
2003 5547 (-7.03%)
2004 9846 (+77.5%)
2005 6972 (-22.2%)
2006 9652 (+38.4%)
61.7% increase over the span of 5 years.
If UND's attenance increases even 40% over the next 5 years, that would the average at 13,409. As Hammersmith stated the capacity is actually 12,300. Imagine a averaging a full house every home game. Give the fans something to get excited about and they will be there. I'm quite certain that these figures aren't lost on the people in the AD. Someone would definintely have to be checking into expanded seating at the Al.