This issue isn't brought up too often, but I think they need to consider that the audience is getting older now. They're approaching the decade mark here in a couple of years. The whole zombie apocalypse thing is cool in your late teens and 20's, but you start to change when you get married or have kids. Other things in life demand your attention, and your interests change.

Now this doesn't mean that nobody with a family can like the show. It just means that we all get older and enter different phases of life, and our tastes change. The die hard fans who started watching in 2010 may not have the energy and enthusiasm for the show like they used to.