i can't imagine anyone being open "IF" a three is needed now. Rule 1...don't foul a jump shooter been there since the earth was formed. I assume the opposing coach does not want his players going through any screens... on ball or off placing another at the line in the bonus or double bonus situation instead of taking a chance on a miss of the 3 and definitely don't want to foul someone shooting a 3. I expect all coaches to NOT double and leave anyone open since a 3 makes the difference. I expect all switches so someone does not get lost on a screen, but that all players will be defended.
Since the team does not want anyone to get a good look and get caught on a screen...the off ball screen probably cannot receive a pass as a defender is solidly in the passing lane with no worries of a two ball. The safest bet with all things equal is to score off the dribble although things could happen that could allow an off ball screen to be effective with a 3 ball and having no fears the team would go for two points...I just think it probably doesn't go that way.
so "the shot" has to be behind the arc and will be taken with a guy having a hand up. There will be no open look, there will be no lunging at the ball...the defender will not move to allow the shooter to lunge into him as he is shooting hopeful the refs bail him out. The guy has to rise and hit it with a hand in his face. Under the right scenario all things are possible, but I question if another coach said to double and leave anyone open and since I see them switching to keep the ball in front of them I'm led to believe it is a contested shot totally different than what may happen through most of the game...but I also know that the best laid plans sometimes go astray when the game starts...