This was the first time seeing this movie. I liked the fact that Rick is entirely self interested at first, he runs a speak easy in neutral Casablanca and seems to care for few except when it effects his business. He seems like a real scum at first, then you see the caring relationship he had with Iisla in the flashbacks. I wanted rick to get her in the end but the husband was more important to the overall plot and theme of duty and loyalty to ones county and women in the story.
I had fully expected that Rick would give himself up, be shot, or sent back to the concentration camp as the plane took off. I was shocked when Rick shot the Nazi officer and became business partners with Louie Renault ("Louie, i think this is the beginning of a beautiful friendship."). this seems to go back to Ricks' shady line of business and the fact that he's good at dealing.
Louie seems to have regained his pride as a Frenchman and seems to want to keep fighting for the french rather than peace with germany (as indicated when he threw the bottle, of Vichy champagne in the garbage.)
I don't think that this movie should be remade, but if there was a movie that was with similar themes, made into today's world. it would have to focus on national pride, loss, and the idea that even a criminal can have national pride and fight for his country.