I saw one report where they are predicting a billion viewers! Surely an over exageration.
Of course, only 10% of them will have paid for the privilege...
Until we all have all 8 seasons on disc, and can scan through start to finish, it will be hard to fully critique the thing because of all the story arcs. The big story, the impending war against the undead, hasn't come to fruition yet. Some of the individual story arcs have been great, some not so much.
Still, compare and contrast to the bulk of TV viewing. The several Real Housewives of Whatever, the singing/talent shows, etc.
1 NCAA BSKBL CHAMP
2 NCAA BSKBL-BRIDGE
4 BIG BANG THEORY, THE
5 YOUNG SHELDON
6 ACM AWARDS
7 60 MINUTES
10 CHICAGO FIRE
top two are sports, then NCIS (an old franchise leftoever), two related sitcoms in their twilight years, music awards show, cop show, talent show, fire dept show.
Absolutely nothing that hasn't been done to death many times. When BBT came out it was very innovative, but they're riding that horse into the ground.