The Cubs have a season ticket base somewhere around ~25,000, give or take a thousand. With over half the park already sold, it doesn't take much in the way of single ticket advance/walkup sales to put together a nice total. Wrigley hasn't seen a significant stretch of sub-20,000 games since the early weeks of 1998, on the heels of the disastrous 1997 campaign, just four years after the industry-crippling strike and before Wood/Sosa took off. Incoincedentally, those were also the days when you could show up a week before the opener and buy season tickets in fantastic locations. Big crowds were common on summer weekends, but the Cubs always struggled to sell games in April and early May. The Cubs' attendance will continue to be insulated by strong season ticket sales so long as memories of white-hot demand in 2003-2004 linger. Those years created the waiting list, and new buyers coming into the fold should sustain ticket sales until/unless continually brutal on-field performance leads to the list becoming irrelevant.