As most SFs know, the title of Episode 8 will be The Last Jedi. But since Jedi might be singular, Luke might die! They probably want to introduce a new character or have Rey become a Jedi, since she is strong in the Force. So, Luke will die, leaving the character/Rey to learn in his/her own way, like Luke did after Yoda’s death. I hope this theory won’t come true, but it seems so likely. After the death of Han Solo and Carrie Fisher, the movies will want to introduce a new trio (or most likely follow Poe, Fin and Rey again).
RIP Luke (maybe)
PS: I had a picture of an origami old Luke but for some reason I couldn’t resize it.