I don't think they're going to kill everyone off all at once, but I wouldn't be surprised if we lose another couple of Scions before 7.0 is done.

Part of me thinks Y'shtola or Thancred are next on the chopping block - but Y'shtola has the benefits of 1. Incomplete narrative arc (she still hasn't learned Warp yet) 2. being way too popular.

So yeah, my vote goes to Thancred for the dead pool.