Really, SD:MI was a Scooby-Doo series for people who don't like Scooby-Doo, such as myself -- so it follows that it might not appeal as much to people who are fans of the more conventional Scooby franchise. Sure, there were elements of homage, but also a lot of revisionism and deconstruction, and the stories, despite mostly following the standard formula, tended to be darker and edgier. And especially this last batch of episodes got increasingly dark and strange, and departed further from the sort of thing most people looking for a show about Scooby-Doo would expect or want to see. Honestly, I can see why CN might've been uncomfortable with the darkness and scariness of those last few episodes.
That's interesting. I am a (mild) fan of the original Scooby-Doo
and some of its sequels and I liked this a lot. Your description makes it sound like something I'd dislike on various levels, and yet this was a re-imagining that I found to be as good or better than the original.
And I'm sure a lot of adult fans of the Scooby franchise felt the same way about it. This was definitely a show made for older, more sophisticated viewers, people who would appreciate references to Twin Peaks
and Lovecraft and Harlan Ellison and Star Trek
, people who would be able to look back on the silliness and contrivances of earlier versions with enough irony that they could appreciate this show's affectionate deconstructions, and who'd be receptive to the deeper and more thoughtful characterizations.
But viewers like you and me are not the demographic that Cartoon Network and its advertisers care about. The target audience of preteens, and the parents choosing suitable viewing material for their preteens, might have found this version too dark, too weird, too confusing, too far removed from their expectations.