User blog comment:MRR1/SPOILER/@comment-26144212-20150225025335

I don't think the grounders would accept anyone but another grounder as their Commander, even Clarke or Octavia. They're growing to respect Octavia in her own right, but the only reason they have any attachment to Clarke is through Lexa so if she dies Clarke loses the source of her legitimacy.

I'm also not convinced Lexa will die - without her the Grounder/Sky People alliance falls apart (which is bad news), and just because the actress does another show doesn't mean she has to die in this one. She wasn't set for the Walking Dead spinoff role until January sometime, when the final episodes of the 100 would have already been written and filmed, so if she dies it's not for that reason. Plus, it's too predictable - I know this isn't the best reason, but the writers have never been known to be predictable, and I see no reason that they'd change that now.