That is a good idea, but i don't think it would get far. Everyone knows Minato is dead and in the world of Naruto, copying someone else down to the last detail isn't as hard as is it seems. However, I do have a few ideas of a good movie/arc.
First off, one possible outcome of the 3rd Shippuden movie would be dedicated to the growth/blooming of NaruSaku. One way this could turn out is a movie that is based on Sakura's point of veiw. We would see the conflict between her inner feelings for Naruto. Then, Naruto could do something so nobel and amazing, it drives her emotions over the line and causes her to finally admit her feelings in one way or another. Personally, if there IS another Movie, i hope this is the subject they decide to use as the story plot.
Another idea I had of a possible arc/movie would be something involoving Naruto's mother, Kushina. It has yet to be proven that she is truly dead, so their could be the possiblity of her still being alive. Naruto would eventually learn about his parents. After hearing the stories of his parent, he then sees that there might be a possiblity that she is still alive. With newfound insperation, he sets out with his team to find any information or possible whereabouts of his mother. Personally, i think this would be a good chance to shed light on Naruto's mother, seeing as how she was only mentioned in one section of one chapter in the whole series.