I may be harping on students and young alumni in particular, but the following applies to fans of all ages. There are maybe 20,000 people (including, I'd imagine, the vast majority of posters on this board) whom are die-hard fans of this program, and would show up to the stadium to watch the team play regardless of W/L record, coaching staff, tailgates, drinking, etc. Then there are people who attend the game for a combination of other reasons: to hang out with their spouses, friends, and/or kids; to have a really enjoyable tailgate with food/drinks; a great Saturday of pregaming/partying and then watching some football; and last but not least, the excitement of winning football.
Unfortunately, I don't think Rutgers is capable of doing the latter constantly enough to sustain capacity crowds and season ticket demand to the point of a waiting list (if I'm proven wrong in the near future or especially this season, then I'll gladly eat crow). Take away the excitement of winning, push young alumni/students to College Avenue because there is too much harassment/inconvenience involved in Busch tailgating/pregaming, and then subtract some friends, spouses, and kids who don't want to attend the game because it has lost its worth for them. Then what is left? The answer to that question was prominent in the early 2000s.