To put it another way: let’s say there was a feature film series about Star Trek: Deep Space Nine which featured the return of Gul Dukat in the second film. The post-credit sequence at the end of our hypothetical DS9 film which reveals Dukat would elicit crickets in theatre.
Like most Tor.com articles, this one isn't that great. But now I reallyreallyreallyreally want a DS9 film with this reveal after the credits. Holy crap would that be fantastic.