Monday night gave Mavericks fans a glimpse of what might have been. Actually, this week will be full of what-if reminders.Just in time for Christmas, the Mavericks’ 101-76 drubbing of Orlando at American Airlines Center was the first of a multi-episode Mavericks version of It’s a Wonderful Life.Vivid, high-definition depictions of Life With and (gasp) Without Luka Doncic.