I like this. I like you.
If the Avengers trilogy sticks to the traditional 3-arc structure (and I don't see why it wouldn't), #2 will be the darkest.
It's really no secret that no one on the team likes Fury/S.H.I.E.L.D. and at best, their cooperation is begrudging. I could easily see those tensions coming to a head in A2 and the partnership being shattered (for a time, at least). If they do bring Coulson back, that would be a smart way to do it. No simple handwave scene ("Oh, hey guys! I'm alive!") in any of the upcoming sequels before Avengers 2 would be nearly as good if he could be used for much larger purposes. And didn't Whedon say he survived? I'd like to think that he wouldn't just flat-out lie to his fans.
...that, and I believe the powers that be would be incredibly remiss to ignore the massive wave of backlash that's erupted ever since the movie came out. If he stays dead, fine, but it's obvious he means more to the fans than they anticipated.
/2c kanyeshrug.gif