I don't think it would be abandoned completely. But staying there wouldn't be good either. A few people to watch over it is very likely.
I think they were covering their bases to see where they can take to story. I'm much more on the "Inquisitor back please" side because i felt that the "more to be told" hints were stronger than the "it's over" hints. But this is why it's such a hot topic. People picked up on both, and have a preference .
Well either way it makes perfect sense. Thematically, story wise, practicality within the realms of the verse. But it now makes perfect sense, what you just said. Because BioWare, as writers, are very smart and they have been doing this for a llooooonnnnggg time now. So they know they have to cover their bases both from an RPG perspetive, a fan perspective, and the fact they clearly have a general skeleton and framework for the Dragon Age but may not know exactly how they are going to fill it in. Which I think is part of the masterpiece of their writing for DA actually they are doing a very bold experiement in not only game writing terms but writing writing terms I want to see them pull it off...ahem.
I know, right? I've generally been pretty dismissive in the past - laugh's on me now, I guess! 
I know.
I never grew this attached to the Warden, and again like another poster on here whose name escapes me I am not way more attached to my Inky because of Tresspassers then not becuase of Tresspassers, they are not firmly my second favorite RPG protag of all time, close second to Hawke, so its tough. But you know they did kind of do the same thing to the Warden. I felt their story was over with Witch Hunt. One of the reasons I still kinda like Witch Hunt, it did wrap up the story. BUT then along comes Inquisition and he is investigating the Calling. Sure it makes sense he would not be going silent. Sure it would make sense he would stay active. Sure him doing that makes a lot of sense, but it adds him back to the board as a major story piece.