The addition of Hunter and Bobbi was a huge shot in the arm that helped make the show bearable. I get wanting to spin them off onto their own show, but they just made the parent show a lot less watchable by writing them out.
Yeah I they are great characters. Hopefully they can still go back to Agents of Shield if the story calls for it. Yeah they said goodbye, but that doesn't really mean anything. I doubt in their own show they are going to just go off and be a normal couple.
BTW, how does Bobbi call her batons back? That was pretty cool. I don't remember them showing that before.