If they are planning on this being a trilogy, it’d be cool if Jabba was either behind this whole heist or he comes in at the end and kills everyone outside Han, Lando and Chewie and offers them the chance to come work for him or die. Show how ruthless Jabba really is.
However, they said on Star Wars Show that this film has a ton jokes in it. Jabba killing everyone would be a bit too dramatic.