I'm a big Diaw fan. but, I don't see Diaw will ever put 10+ ppg more than 2 or 3 seasons. He won't score much but I think he will develop a three point shot. From what I've seen during his years in Pau Orthez, he's able to knock down treys when he's open. Not that he's a three point specialist. But, he's not a bad shooter; he just doesn't shoot that much.
His best season would be:
10 ppg 8 rpg 5 apg 2 spg 1 bpg
and his career stats would be:
7 ppg 7 rpg 5 apg 1.5 spg 0.5 bpg
This guy will fill up the stats. But, his impact to the game is beyond the stats. He's a true role player. Every player and coach in the NBA would be happy to have a guy like him on their team.