Well that is a BIG question. I tend to think his scoring efficiency would go down, but his ballhandling/passing efficiency would go up. But that is just a guess. Manu is more of an all around player, not a pure scorer if you play him 40mpg. Even he alludes to this as well. In 30-35mpg he can be used as an excellent scorer per minute, while also providing a solid floor game. But all that changes with more possesions, minutes, pressure, and responsilibity.
I think Manu still can improve on his turnover situation. That is his main weakness and my only gripe on his game thus far. I think he can limit those turnovers even despite his 'wild' style of play.
As for those other elite guards, well they are better than Manu. Wade and Iverson may not have won a le, but they are playing better basketball than Manu. They have accomplished more in the NBA as individual talents and how it fits with respect to their team.
Winning on the international stage is nice, and I respect Manu a lot for it. He has shown his character, leadership, and his ability to win despite his team being the underdog. But I am not going to use that as a major basis for saying he is a better NBA player than the NBA's elite swing men. His international accolades are not enough to elevate him over and into the NBA's elite. He is an all star, but not a dominant player in this league at his position. He is an above average player, and an all star teamatte. A championship type of player. But he is no more of a leader of an NBA team than Tmac, Iverson, Kobe, or Wade. He has not proven as much as these guys on the NBA stage. I hope he can continue to improve into next season and eventually be a borderline elite/perenial all star calibur NBA guard. He has the goods to possibly even be a better player than he is. But who knows, if he will get any better? Who knows if he really could lead an NBA team any better than Iverson or McGrady?
Until he improves a bit on his turnovers, plays a few more minutes and/or increases his scoring I do not think he can be considered elite. Maybe if the Spurs win the le in convincing fashion a few times, and he continues to put up 17-18ppg-5rpg/4apg , than maybe you can make a better case for him being a perenial all star and elite guard in this league.
I hope he gets there, but he is not there...yet.