It appears as if they're setting Rick up to take out Shane, but I think someone else will end up doing it. I can still see that being Carl though. At some point, I expect he'll feel as if he has to do it to save either his mother or father. Of course, Hershel and Dale are both possibilities as well, since both have an intense disliking for Shane, or will the Zombie's get him first?. The only was I can see Shane staying on the series is if he and Andrea go off on their own, maybe convincing others to go with them.
I also wonder if Lori will lose the baby, because of the accident. I know that hasn't happened yet, but possibly some that will come up down the road, as a delayed outcome.
And what's going to happen with that other group. Several of them have been killed by this group now. Will they just let it go or seek revenge. Will the injured kid rejoin them, be left on his own or will they take pity on him and let the kid stay?