While I would love an entire Indy theme park, or an Indy/Star Wars park, I think it would be heavy overkill on the Indy side of things. You could do a lot of different rides and attractions with Star Wars, but I believe for the general audience the Indy stuff would get old. And most people would say, "I don't remember Indy finding Atlantis..."
That said, it seems to me the way to go would be a Lucasfilm park. HUGE Star Wars area with shows, rides, shops, etc. Good size Indy area with a few rides and attractions, even loosely related like a Disney-style jungle cruise.
And then individual rides or shows for all of the other memorable Lucas films (even if they were pre-Lucasfilm).
That would rope in:
* American Graffiti (classic cars and rock 'n roll). That could include a 50s diner, rides, shows...
* (skip Howard the Duck)
* Land Before Time -- kiddie dinosaur land
* Labyrinth is a maybe, too