As you know, I am very rarely a fan of remakes. I think if a movie is great, then you should just leave it alone. That being said, I think a remake of Grapes Of Wrath is a good thing and here is why. Is it a great movie? Yes. Do people watch it? Only when forced. I think that if you took the book and filmed it today that you could make it much better and much more relevant to younger people and maybe it would encourage them to read the book or another of his books. I think the way it is right now, people only watch it when they are forced to read the book and don't want to. Steven Spielberg is in talks to remake the movie, and if there is anyone who would do a respectful job of it, I would say he would.
Source:
http://www.crazydaysandnights.net/2013/07/steven-spielberg-remaking-grapes-of.html