There was a time when BC always scheduled our least desirable home game Parents' Weekend. The demand was such that we would sell out the game regardless of the opponent and it was always good to send the parents home with a win. This year BC will host Florida State for Parents' Weekend and unfortunately there are still seats available. (See this ad from BC's Tuesday email.)
Just like there were and are multiple factors in BC's recent decline, I also think there are multiple reasons why Parents' Weekend is no longer an automatic sellout. Some of the factors are probable social. I think there is a growing group of BC parents and students who just don't care about college sports. I also assume that as the student population spreads farther from the Northeast, it becomes harder for some BC parents to make the trip (or make it every year). But the ultimate factor is that the football team has not been fun to watch and the gameday experience has not been special. We all know that BC is working to improve both. When we do, I think parents will come back.