Anyway since the thread is going in different places.
Isn't it also plausible that she could activate her Mangekyo Sharingan under the distress of her home village being destroyed?
Or the fact that it was revealed that the strong emotions didn't have to be negative in order for the sharingan to develop. I don't see why people are still only thinking on an outdated Uchiha thought process.
It could happen that way but she's already began developing her sharingan on positive emotion in gaiden. I don't see why she would not have MS by the time we saw what we did in the first chapter.
I think it makes sense for her to already have it by then if Boruto is going to be doing that and Mitsuki is flaunting SM.
I wouldn't care if a past character died. But off panel relevance still matters and so I doubt it. Naruto and Sasuke are most likely to die due to their power levels or at least be crippled in some way that they can't just come and save the day.
All other characters would be unable to step in and take on a threat that flattened the village, which means they would not need to be killed necessarily beyond the plot of them just dying in the blast.
Sakura is not a major character anymore to be highlighted and killed front and center for Sarada. I can't see them wanting to do that. The only way it could happen is if she pulled a Hinata and got way in over her head without backup. She'll more than likely be remote healing if she didn't die in the blast than actually going to fight. It's never her initial go to.