You seem like someone who isn't new to fandom and I have to ask: have you ever had the experience of seeing a large chunk of a show's fanbase actively campaign against a spinoff? i.e. is what's going down with The Blacklist a unique case?
*rickety grandma voice* I’ve seen some crazy-ass shit, son.
Jokes aside, yes, to me it is rather unique, anon, because TBL/R is a unique creative catastrophe. More rambling and complaining behind the cut, as usual: