That can't possibly be true. Over the course of a season, averages will normalize, and because he's currently a .280 3 point shooter, that doesn't mean he will be when the season is over. Omri shot .362 in November, .422 in December, and is currently .462 in January (3 point shots). Where will his overall average be? Who knows. He might slump in February having recently hit his peak, or he may stay at .462, which would be awesome. He also shoots .550 on Mondays, and .150 on Fridays - should we bench him on Fridays?
Shooting averages are not like flipping a coin. It's not the theoretical probability of heads/tails, or else more players would be closer to .500 when they shoot. Shooting a basketball is a much more experimental process, and you can "get hot" as your confidence increases. I've had games where my players have done everything but make the shot, and other games where they couldn't miss. There is a human element that can't be denied.
Shooting averages in basketball are good to tell you what has happened, but they aren't as reliable a predictor of future success - that's why you play the game.