Ok....so let's do some ranking:
Daryl would be the choice that would upset me the most. He's one of my favorite characters of any show, and I think he's the guy I want to be if there's ever a zombie apocalypse. If they kill him off, I'm going to be seriously bummed to start the season.
Of the people there, Aaron or the [not Michonne] black chick would be the two I wouldn't miss at all. They have roles in the show, but I'm not vested in either of them.
If Eugene or Abraham, then I'm going to miss their banter and especially Abraham's one liners.
It's not Carl.
I'd be bummed if it's Michonne but mostly just because she used to be more awesome than she seems to be now. When she showed up with two zombies on a leash, wielding a katana, she was the coolest cat on the show. Now she's a shadow of that coolness.
Glen or Maggie? Meh......I like them both, but it won't ruin me if one of them is gone. I'd miss them mainly for nostalgic purposes, but the show would go on without them just fine.