I've enjoyed the first two episodes even though you could have probably skimmed some fat and combined episode 1 and 2 into one 80 minute story. Still, most television series tend to crash after seven seasons for a multitude of reasons. Writers come and go, cast members age, stories get stale and sometimes, they literally run out of topics. I think the main reason 99% of the fans still tune in is because we all want to see how it ends. There's a ton of loose ends that need to be tied up and everyone wants to see how that plays out. I honestly wouldn't want another season even though I've loved the series. The story has reached it's crescendo and it's time for a conclusion.
I used to be a huge Walking Dead fan but after realizing the writers had no actual ending planned and were just planning on writing episode after episode, it really lost it's value. They kill off characters and bring in new one and new locations to try to refresh the show but it's all repetitive now and feels like a sitcom/drama instead of an epic story.