putting incest aside, Julia is the only character truely supporting MC's dream, fuck! she even does more to make it a reality than MC himself: she stood up to the father, she talked some sense into Emma, and when the band got their first gig she watched the video with quite the enjoyment, she also genuinely cares about MC's life. And unlike others, she doesn't push her own shit onto the MC, she even hooked Jacob with some groupies so he wouldn't bother MC Lisa and Jade. Now let's speculate on the case that Julia indeed dies, how do you think it will affect the MC? It would be devastating to him, since even without any incest he and Julia were close. Who's gonna be there to lift him up? no one, or at least no one that would make sense... for sure not partyboy Jacob, nor the "I want a friend" Lisa, Jane for sure will be too busy running the company in Julia's stead, and honestly I don't think she's buying into MC's dream, more likely she sees him as the inheritor of his father's fortune..