Lucasarts will still exist as a brand for licensing. So, if someone went ahead and made an Indiana Jones game, it would still have the Lucasarts logo at the startup, but realistically, nobody on Lucasarts' side (which is Disney now) would be involved. Instead, it would be a developer making the Indy game, and having to pay a substantial licensing fee to Disney for the use of the Lucasarts brand (which would include Indy games).
For Disney, licensing means they don't have to assume the risk of the project's development costs. I would assume they would have licensing guidelines, like the developers of this hypothetical Indy game couldn't do anything unbecoming of the characters, like portray Indiana Jones as a pedophile, but otherwise the developers can make whatever they want to. The developers now assume 100% of the risk involved in making the game, including whether or not it will sell, be released on time, etc.
For FFG's part, they are producing table top Star Wars game, which I imagine are doing quite well. So Disney, via LFL, is going to get that licensing payday, because we are all buying through their Star Wars LCG and X-Wing product. When the RPG starts getting proper releases beyond the introduction game, this will probably follow suit.
The only ways I could see the license getting pulled would be if FFG decided it wasn't profitable for them to retain it, or if another company with even more money came to Disney and wanted that table top exclusivity.