I completely agree, it's demeaning and stupid. No Blake Please.Using Don Blake in the funny way they did in Thor 1 was perfect. No need to give him that permanently.
Now, what i do feel we're going toget is some sort of clone. Anybody notice the Knife that Loki used to stab Thor with had it own little close up! And it is conveniently tossed to the ground on Stark tower! It could be one of those things that Marvel does all the time, little hints here and there.