Unless CBS yanks Training Day from the lineup before all 13 episodes of Season 1 have aired, viewers will have gotten to see a full season of what the Training Day team can produce.
That said, the end isn’t definitively nigh for Training Day.
For one thing, competition on Saturday nights isn’t nearly as stiff as on weekday nights, so low ratings might not matter as much.
For another thing, the entire first season has already been filmed, and Bill Paxton actually completed his work on the season before he passed away.