There is a limit to the ideas for any type of show, eventually things get repetitive and the viewers get fed up and they move on to something else.
The Walking Dead is in that stage as many mentioned here comes the brutal leader who oppresses out group, and then eventually they dispatch him. The problem is how long can this continue, they try it by making each psycho worst that the previous.
I still enjoy the show, great production values, nothing cheap in this show and we do have good performances by the cast.
The whole Zombie craze is coming to an end, it is running its course, first we had the westerns, then the seventies brought in the private eyes, the cop shows and so forth they all played out.
The Zombie crazed will also wear out on viewers, when it does TWD will close shop, it is still huge but even so many viewers have tuned out.
Then what do I know.