Last night was a lot of rather squicky things. Riffling through the daycare was an especially unpleasant bit given what they could have had been there.
With Michonne and Andrea something that I think some viewers are missing is that yes, we know the governor is really messed in the head. We know that things in this town are not on the level. Michonne only has a vague suspicion of it. Andrea hasn't seen any of the messed up side, at all, and Michonne has done nothing to really convince Andrea she's right beyond, "I don't like it, lets go." From Andrea's standpoint, well until last night, this really was what she was looking for all along and she's seen nothing to refute that this is the solution to their problems. If anything Michonne's loner nature is the problem. Her communication skills suck.
They'll make the show run another season easy, maybe two. Remember, this makes money and brings in viewers. If they need to justify the zombie apocalypse lasting a few more years it'll be, "Yeah, that's what he thought but he's just a smart quack, not a zombie M.D." or "Really, REALLY slowly." And really, we don't know Milton's creds. As much as I'd like to think I could make a pretty good mad scientist in the ZA, well, how much does your previous experience really help you here? After all, you think they're starving but back in episode one we saw a walker who was cut in half still mobile and functioning with half her body gone and her vital organs being pulled along behind her. I'm not going to buy into a reanimated corpse starving just yet.