no, no, no, no, NO!
im not saying that your dream team wouldnt be successful, im just saying that the team wont necessarily be the best, because all of the players you mentioned, with the exception of kidd, thrive INDIVIDUALLY, but if they're all on the same team, then they will fight with eachother who gets to score. See, thats why a team like detroit is so great, because nobody is a superstar, but they are all decent players that have like the best chemistry in the NBA. They are all also very unselfish, and they all play solid defense and not only that, they play solid TEAM defense, which is something totally different from individual defensive skills.
All those guys you mentioned have experience in the NBA, but they dont have much experience playing with each other, and thats a problem. im not saying that those guys wont be better than LeBron, Carmelo, and Wade, but im saying that just because you have great players on the SAME team, it doesnt mean that the team is unbeatable, and they could very well miss the gold as a team. Different players play differently on different teams. For example, Ben Wallace, he was practically unknown when he played in Washington and Orlando, but he became an all-star in Detroit, and he derserved it. Another example, Boris Diaw, he didnt fit in to the system in Atlanta, but with Steve Nash in Pheonix, he became the most improved player. So, just becaiuse AI or kobe averages 30+ points in their RESPECTIVE teams, doesnt mean they will score that many while on the SAME team.
i think its a little naive to say that a team made up of the best individuals will be the best team.