Godfather 3 - Don't we have the technology yet to just entirely replace Sofia Coppolla with a new actress?
And could pretty much be the same idea. There's absolutely no need to recast Michael, Kay, or Connie because all of the actors were wearing old age makeup at the time, so there about the right age, maybe a bit older. And we can put Robert Duvall's character back in their like he was always meant to be. And get rid of the icky incest relationship between his daughter and her cousin.
Star Wars 1 - I don't like 2 very much either and 3 while the best of the prequels is still not up to snuff. But if I have to choose why not just start off where it all went so wrong. Just let Peter Jackson or Guillermo del Toro do everything.
The Scarlett Letter - WTF is up with the Demi Moore version? Among much awfulness including a character from Arthur Miller's the Crucible making an appearance, the ending is the poster child and grand daddy of Hollywood whoredom.
Breakfast at Tiffany's - I love Audrey Hepburn and all, but this just isn't a very good movie. George Peppard is dull, Mickey Rooney (I still love you Andy Hardy) is embarassing, and we never really sort out that Holly has mental issues problem.
premise: Go back to the original material and keep the male lead gay. Don't try to cast anyone like Audrey Hepburn (sorry Natalie Portman) because it would only be an imitation and that would distract the audience, just go in a new direction.
Love in the Time of Cholera - Haven't seen this but it's my favorite book so the middling reviews really bothered me. How could this not be one of the greatest films ever made? I would remedy that.
This certainly deserves a redo. Believe it or not Javier Bardem comes off creepier than No Country for Old Men.