it is bizarre to voluntarily end conference play a week early. Now there are small conferences that have season tourneys that end fairly early and there would potentially be room for a Big Ten team to try to schedule an OOC game the last weekend against one of those smaller schools, but I can't see any reason to do so since it couldn't possibly help your seeding in any meaningful way combined with the potential downside of an embarrassing late season loss and injury risk right before the tourney.
So as it stands, Big Ten schools will probably have a 10-13 day layoff before the NCAA tourney next season. Great for resting up and getting healthy, but I'm sure teams that are playing well would rather just keep the momentum going instead of sitting at home for nearly 2 weeks.