Let's push away the angst for once and lemme pull out my theorist brain Spoilers for lukes personal story First of all, he has a low chance of dying because he's one of the 4 male leads of the game, thus he's an important person to the plot. Second of all, in his story we see his personal doctor yelling at him with something along the lines of: "What do you mean two months isn't worth it?! In that two months we could discover a new technology to save you!" Which indicates that Luke is probably going to be saved at the last minute.
