Wargames
One Of The Last Real Ones To Do It
Unless they put a massive hold on the story, just based on the book, I can't see this going more than 3~ seasons without them slowing the story down something vicious, or just loading this with filler. It's definitely one of those stories that will be hurt massively if they don't get to finish the storyline before it gets canceled. Like... some shows can survive that. This story damn sure can't because it won't make any goddamned sense without the conclusion. So I suspect we'll get a renewal notice next season a few episodes in, and depending on how much of the source material is left, maybe that'll be it.
That being said... that last season gotta hustle to get a Game of Thrones level budget just for the CGI for that Rock City shyt... If they can do that, it'll be some crazy visuals, especially with the cinematography work the show has already showcased.
Apparently Gaiman is writing a sequel
Neil Gaiman on When You Can Expect 'American Gods 2'
Plus Anasi Boys and the short story he wrote post the first novel might be enough to keep the series going for 3-5 seasons