No, there hasn’t. Supernatural has about 1.7 million viewers each week (on average). Out of that number, only a very tiny percentage are shippers. I was talking to one of my friends the other day who loves both Supernatural and The Walking Dead. She’s been to TWD cons and now she’s going to a SPN con. I said something about destiel the other day and she said “What does that mean?” So I had a very uncomfortable discussion with her because she was honestly totally bewildered and surprised by the whole thing. I asked her what she thought they were talking about when they mentioned the ships in the episode Fan Fiction and she said that part must have gone right over her head. She has never seen anything romantic between Cas and Dean (or Sam and Dean for that matter) at all and she just didn’t get it. Those are the people that make up the silent majority of the SPN fandom. They aren’t on Tumblr, they aren’t obsessed with a ship, they don’t see the supposed subtext. They just watch the show because they like it and they like the guys. If they suddenly made that ship canon after 11 seasons, most of that group would be so confused. Think about it- there’s never been any mention of Dean being anything but straight in canon. He’s never expressed romantic feelings for Cas at all in canon and has in fact called him family and said he was like a brother to him. If you view it through the eyes of the general non-shipping audience, making the ship canon would be from so far out in left field that it could quite possibly make them stop watching. TPTB know all this. It’s not news to them. So they’ll just keep trying to make everyone happy and none of the major ships will be made canon. That’s my thoughts on it anyway.