The story of how Boba Fett ended up being tossed into the Sarlaac is one of the great behind the scenes stories of Return of the Jedi. Lucas was going through his nasty divorce at the time, and they asked him what they should do with Boba Fett during the big Sail Barge battle. Frustrated with non-Star Wars things, Lucas told them to just toss him in the pit. And the rest is Star Wars history.
In the years since, Expanded Universe authors have resurrected Boba Fett due to his fan following, and it appears as if Lucas agrees with them.
Jonathan Rinzler, author of the must-read “Making of” books for the three Original Trilogy movies, is doing a Reddit AmA today and he says George told him Boba Fett survived:
Yes, he does. I have been in meetings with George where he confirms that Fett survived. If it comes from George then it’s true!
With Boba Fett being potentially alive post-ROTJ, that opens the door for a spin-off movie that isn’t another origin story…