So it turns out that the main thing responsible for some of our most-loved LucasArts adventures is - uh, geography. As Dave Grossman explains:
"After LeChuck's Revenge was finished, Ron Gilbert left LucasArts to form Humongous Entertainment, taking several staffers with him. What I'm not sure is widely known is that Tim Schafer and I both intended to go with him. The thing that changed our minds was when they decided to found it outside of the Bay Area. Had they stayed local, Tim and I would have joined them, and Day of the Tentacle, Throttle, and Grim Fandango would not have been made. (And Tim and I would probably be wealthier.)
It's an intriguing glimpse into a different world. There's also mention of a PS2-era Indiana Jones Trilogy game which was held-up in the development process, but which would potentially have been great.
We had the full Hovitos temple built out with the rolling boulder, and it was all awesome.
Weird stuff.
Source: 1up