If they do get someone new Harrison Ford should be no where near the thing. This could only demonstrate how much better Ford is to the replacement. A comparison is risky. The best years for Indy are the 1930's. Surely they can just go back there and start afresh. If Indy is supposed to be born in around 1900 they could even start them in the late 1920's. Maybe it's just me but I don't think the adventurer archaeologist format works as a post war idea.