They don't when the intention was to kill the main character. The multi-picture deal thing was probably a power thing, and before Jones read the script and knew they wanted to kill her. Like, "hey, we want you for this, we'll pay you X amount of money, sign on the dotted line for 3 movies", but knowing they never intended to actually pursue more than one. Jyn is hardly Han, it's apples & oranges. I'd put money on Ehrenreich & Glover (maybe even Clarke) appearing again somewhere down the road. Whether that's "Solo 2" or more of a general ensemble underworld type of movie who knows.