Here's an idea that would be able to accommodate Harrison's age, and still allow him to be a bad ass as Indy, without him having to do too many dangerous stunts. Have a few for sure, but have him use more of the skills he learned from Anthony DeLongis and incorporate more whip action into the movie. Each film has seen him use his whip less and less. Not only is it one of his trademarks, but when you look at Raiders, he used it a LOT and it was woven perfectly into the story. It can be done and if he uses it in new ways than he has before it would add to his character by showing that his skills with a whip have only gotten better with age. Plus you don't need ****ty CGI to do those things. They can be done practically on set and filmed.
While the Nazis are an obvious villain, not only would they not work for the timeline of the new film, but they've been done before. Twice. We need someone new. They say a hero is only as good as the villain he/ she fights. Indy is no exception.
Though the absolute most important factor that I think most people miss about Indiana Jones and what this new film NEEDS to have is this. What makes Indiana Jones, Indiana Jones is the fact that he will get in WAY over his head and just when he is about to die he does something out of pure desperation and miraculously it works. He doesn't plan it. He doesn't scheme (mostly because he can't spare the time in those moments.) It's like fate steps in and works in his favor. Think of the most memorable scenes in the movies.
More often than not, he just acts out of pure desperation and he wins. To me that's what makes the character so compelling to watch repeatedly and what makes these movies so timeless. Anyone else would die if they got themselves in those situations, but not Indy.
