I think an Indy storyline following his time in the OSS would be interesting, and get him back to his classic villain enemies, but I think it may work better as a TV series, and less as a movie with a beginning, middle, and end all wrapped into one thing. Just my thought.
KotCS sucked. Harrison Ford was Indy throughout, and true to form... All other aspects of it sucked. **** those monkeys and giant ants.