I think Luke would appreciate hearing the perspective of someone living who lived through the old Republic and was a major part of the old Jedi order. Not only for just the stories she could tell about the Jedi and his father, but for what Ahsoka could tell him about what the Jedi did right and where they went wrong (which she knows all about).
I doubt they'd put all this work into Boba just to kill him off.
I mean, jeez, Temeura Morrison started out just playing Jango (and the Clones), then he redubs Boba in the original trilogy, and now he's physically playing Boba in probably the most action and dialogue he's gotten in live-action with all the movies put together.