All good reasons for Rochelle to be killed instead. Bill/Francis are too badass to actually die and Louis can't die thanks to the power of peelz (and what sevlag said).

Also, I don't mind them putting some plot/story into the L4D games, even if it means one of the best survivors dies. I mean, think about it: we're having discussions on characters we think will die/shouldn't die. It may not have been done through super complex characterization, but we managed to find some personal attachment to at least one of the characters. It may not have been totally necessary, but it makes the game a lot more fun.

Then again, I think we can agree that Rochelle blows because of the lack of character.