I really don't think that's the issue at all. If you compare this year's team (one of the worst under Donovan) to last year's team (the best winning percentage we've ever had) it doesn't look like three point shooting is the problem. Last year's team scored 70.1 points per game -- 19.5 from 3s, 35.5 from 2s, and 15.1 from the charity stripe. This year's team is scoring 65.4 points per game -- 20.4 from 3s, 34.2 from 2s, and 10.8 from the charity stripe. What's interesting about that is that this year's team is actually scoring slightly more points from 3s, slightly less points from 2s, but almost 5 points less from free throws despite shooting about the same percentage (66% vs 67%). Hill gets to the line more than anyone else on the team by the way and his 62% shooting from there is just as efficient as a 40% three point attempt.
It might be surprising that we are scoring more from 3s this year, but when you look at the guys we've lost -- Young, Yeguete, Prather, Wilbekin and D Walker -- only Wilbekin and D Walker were shooters and Walker only played about 10 minutes a game anyway. So last year you had Frazier and Wilbekin both hitting in the ~40%+ range and then DFS and D Walker hitting around ~30%. This year we have Frazier and DFS both hitting in the ~40% range, Carter and Chiozza hitting around ~30% and then Horford and Robinson hitting around ~25%. Even as bad as they are shooting those last two are holding a defender out on the perimeter so in reality we have more shooters on the floor at all times and we are harder to defend on the perimeter compared to last year regardless of the fact that Kasey Hill is on the court for 7 more minutes (29 vs 22) this year.
Of course last year's team also struggled to score points at times and owed its success to the stingiest defense we've ever had.