Great analysis (In two posts). Killing the doctor is going to get them kicked out. They will save the town from the wolves from the outside. A good three-way conflict makes for a good show.
Post-lunch discussion at work:
1. Rick can't kill the Doctor, it would obviously ruin the relationship with Mrs. Haircutter. However, there are two foreseeable options: one, he dies when stuff goes down in town (Wolves or someone dies in-town & feasts or whatever), two, his wife kills him. Two options there: she gets revenge on him for beating her, or he turns out to be a pedophile, in which case her killing him becomes much more justified. I know they killed Buttons the horse with zombies like they did in the first season, but they already killed Carol's husband that way, so it would be crazier if she took him out. Then it wouldn't be Rick killer her son's father, it would be her taking control of her life. But if she does do that, then the entire town loses an enormous asset, because there hasn't been a doctor since Hershel.
2. Darryl & Aaron are out scouting for new recruits. If they let the ROTC's curly-hair buddy out (we've taken to calling him Weasel, haha), he may defect with the other expelled citizens & then lead the Wolves to the town. So we're thinking that Darryl & Aaron will run into Morgan & pull a Carol by saving the town from the baddies like she did in Terminus.
3. Eugene & Abraham are still alive. Judith (the baby) holds the key to the cure, since she was born post-outbreak, so maybe Eugene can extract some antibodies that cures people; at the very, least, fixes it so if they die, they don't come back to life. Eugene is becoming a bigger part of the show - he just stepped up to save Tara instead of chickening out & leaving the group - but it doesn't feel like they're going to kill him off, at least not like Beth.