Maybe, and that's what I kind of fear.
Don't get me wrong, I love Indy. But I like adventure films in general. I don't like the mindset that everyone has where anybody with a brown hat or safari shirt is automatically an Indy ripoff. Yeah, they often are, but how else would an adventurer look? Indy looks like his predecesors and his films are just like theirs, but perhaps a little better thought out.
Instead of a bazillion (forgive me, I like that word) new Indy comics/books/etc., why not newer adventurers. That's why I love National Treasure and Tomb Raider, not to forget ol' Clive's novels. And I just hate to see them compared to Indy. They're in that genre, but they are completely different films.
And, perhaps worse is the fact that I love to write. Naturally, I want to write adventure stories and would like to write adventure novels for publication someday. But I've got the Hell scared out of me that something I'll write may be somewhere in an Indy book or young Indy show (I've only watched the films) and that my story will be deemed a ripoff by adventure-lovers.
So, in short, I just don't want Indy to wear out it's good name. This fourth movie needs to be the last. Indy needs to be young and vibrant, and if another old Indy is produced, 40% of his films we'll have him as an old man. Indy needs to stop while he's good. Pass the fedora (or pith helmet or any hate that the next adventurer will have) to a new generation of writers looking to make their mark on the world.