I don't think that Tara or Rosita will die quite yet, but I could very well be wrong on either of those.
I don't think so either. Both are expendable but they will want to keep some notable people to kill off later when they need something big to happen. They are probably the most expendable main characters right now (along with Morgan). Most of the other main characters left are invincible or important later on to the story and until they build up some new main characters to take their places they won't die. Plus, I think Gimple likes the Tara character because she is his creation.
One of them could die in 8B but I could easily see them going all of 8B without anyone dying. No main characters died in 4B or 6A and if you don't count the cliffhanger deaths or a redshirt like Denise nobody died in 6B either.
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