If you look at the overall slate of college hoops on a Saturday during the conference season, very few games have a start time of 7:00 p.m. local or later. The same seems to run true with college football.
My opinion is this --- fans attending a college game (be it football or basketball) will typically travel from greater distances to the stadium/arena than the average pro-sport spectator. (Case in point -- very few, if any, stay in Pullman, WA, State College, PA, or South Bend, IN after they graduate.) Obviously, you can't schedule a mid-week game at 2:00 p.m., but when it comes to weekends, perhaps universities originally avoided scheduling games that conclude late in the evening/night so that their attendees could travel 2+ hours and still arrive home at a decent hour. That, and you probably don't want to give your student section 10 hours to sauce themselves up prior to every weekend home game.
In any event, I would say the lack of a Sat night game this year has more to do with open television slots than it does BC availability... but again, just my opinion.