Seeing last night episode 3x09 made me think Rick is vulnerable to attacks now, you see in 3x08 he went to Woodbury and he was really lucky no one was behind his back shooting at him while he was hallucinating Shane Maggie was yelling at him and he was kind of not hearing her he was just trying to kill "Shane", he could have one of those hallucinations and get shot maybe? or beaten down from the back?, losing his hand is very unlikely they should be every episode using CGI not to mention Robert Kirkman pointed out he regrets doing that in the comics