He said we wont see it in Avengers 2, he never said we will never see it ever. I personally think that an Avengers/Inhumans movie is more likely and that was what Vin Diesel was talking about when he said "merging of brands" and his probably in the running to play Black Bolt.
I highly doubt he is referring to Inhumans or GOTG. He said merging brands and a brand implies something that has recognition and demand behind it, neither of Inhumans or GOTG have recognition or demand at the moment. Cherokeesam really laid out everything pretty clearly and it seems plausible that this could be the way they are going. I could definitely see a Daredevil movie in March of 2016 featuring Vin as the Kingpin and then making another appearance a couple of months later in TASM3.