Lurker, what you describe is not "BillyBall."
BillyBall is a fast-paced, high-pressure game plan, like Arkansas former 40 minutes of Hell, but whether one chucks up a lot of 3s or not depends on the makeup of the team. Last years team had multiple options for 3-pointers: Murphy, Boynton, Walker, Rosario & Beal, and also Wilbekin & Walker were not slouches. This year's team will also have a lot of good 3-point shooters. Last year's team was, if I recall correctly, the top 3-point shooting team in the nation.
But a good coach (e.g. Billy D), matches his game plans to the qualities of the team he coaches.
I have been involved with BB for almost exactly 50 years, and one thing I have observed consistently through those years is that when you stretch the floor and make your opponents have to be in shape to stay with you throughout the game and especially at the end, even if the other team has better "quality" players, you will win more than your fair share of games. BillyBall does exactly that.