I'm not sure. I mean, it would seem likely to kill off an important character like how they killed off the queen (though we're not certain she is dead or not). But we can presume she is dead from the blast from The Dreadnaught. But the difference between her and I feel any other character they're gonna potentially kill off, is we never really got attached to her as a character. She was only present through a few missions. So if they kill off a main character like Zavala, it would be devastating I think. Also, in case anyone hasn't noticed yet, there's a part in the cinematic they showed of the legion we can presume blowing up the sun (a self made supernova) and it destroys from what we saw at least 2 planets. Though, we have no idea what galaxy that even is for now. But it's clear people will die in Destiny 2 because you can't take loss, without having death involved.