are you crazy??? lol the bucks will never do a stupid thing. Jennings is the next Allen Iverson...lol 
In other words, a good player who'll NEVER win a championship.
Like steve nash, karl malone, barkley, jason kidd, dirk, etc., right?
wrong. The difference between those guys and AI is that they're willing to sacrifice personal stats for the greater good of the team. AI is 34 and he still hasn't learned the concept of team basketball.
Brandon Jennings is young guy, he may get there someday but at this point, he's getting ROY talk for his stats. He's a shoot first PG, which wouldn't fit well within the system that we have. Can you imagine him trying to maintain the egos of 3 HOFers and get them enough shots? From what I've seen of Jennings, that's definitely not his strength at this point. Maybe with a bit more experience, but if this trade were remotely possible, it would be awhile before we could figure out and implement an offense that would work to the strengths of all the players.
Well to counterpoint your argument who else is going to score on the Bucks. Redd has only played 2 games. Bogut is your second leading scorer with Ilyasova and Ridnour next in line. With that talent they should be 3-8 at best not 8-3. Jennings has to score big on that team and he is doing it very efficiently while his coach is quoted as saying Jennings is being a team player. If he was on the Celtics his scoring average would go down but his assists would probably go up. It's only 11 games but still very very impressive nonetheless. If he was still doing this into February I would strongly consider pulling the trigger.
I'm not saying he's not coachable. But I was able to catch a few of his games while he was playing for Roma, and he's definitely a shoot-first guard - granted, he played limited minutes. I believe he averaged about 2 assists per game.
It could very well work, but I think you would be wrong to assume this would be an instant fit and fix. Its really not as simple as plugging in players, this is a kid who's currently a prolific scorer (even averaging over 40ppg his senior year in high school) and if this were to happen, we would be asking him to change his game. It wouldn't work overnight, if anything it would push us more off course for the season. And with this very possibly being the final season with the Big Three, it just doesn't seem like a good idea right now.