Just as Einstein became the symbol for overwhelming intellect, so did Hitler become the symbol for intense evil. I doubt anything could make Hitler popular. You might try a film about the devil indicating how he saw through the many mistakes God made with creating such an imperfect humanity and tried to remedy that, but I have strong doubts there too.

I doubt that a movie about Hitler would be really popular in the US being that Hitler isn't popular. Especially now, being that he seems kind of old news compared to the current crop of villains, like Bin Laden and Kim Jong il.

Speculating about what would have happened if Hitler had done different things is pretty futile. Nobody can really know what would have happened. If he hadn't killed Jews, would he have become as powerful? His reign of terror in Germany may have been instrumental in his success. Hitler was determined to try to conquer Russia from the start and chose to go when he did because he didn't want to give them more time to prepare. If he had waited, he would have been better prepared himself, but so would the Russians. It may have been even worse. Or maybe not. Monday morning quarterbacking proves nothing.