Inhumans is very much the law of supply and demand in action.
Squirrel Girl has a book because people liked Squirrel Girl when she turned up in books. Deadpool was an X-Men supporting character who eventually got spun off into his own book. Spider-Gwen is another example.
I really liked the Inhumans book by Paul Jenkins and Jae Lee. There wasn’t a huge drive for the Inhumans to take the spotlight after that, despite how critically acclaimed it was.
Marvel decided that Inhumans would be a thing. And fandom said “Meh” and assumed that it would be over soon. But Marvel persisted with it, Inhumans it seems are a bit like medicine. We’re getting them whether we like them or not.
And maybe the show will be great. It does have a teleporting dog. I would watch a show about a teleporting dog, Maybe other people will too. And maybe we’re not the audience that they’re looking for.
But I wouldn’t but too much store into the Inhumans show as a lesson for how to do things or not do things. American Gods has been spun off into a TV series, when it could have been a tight movie. Watchmen is being developed as a TV show. Preacher is different from the source material, but also fairly good.