Another member of this site just posted an interesting article in my opinion. He highlighted that, so far, all of the future members of The Avengers, Thor is (near enough) the only member to not be asked on bored. In a sense the ball is in his court. Most may consider that a ridiculous point to bring to the forefront. But personally it's a point I've considered a lot since watching Thor and the announcement that Loki will play an integral part of the proceedings.
So how would I consider that he will decide to play such a large part in Midgard's defence?
Loki? A close second. No, Jane Foster (I speculate) will be the main reasoning behind his inclusion...and, indeed, Loki's.
Here is where I theorise. I think Jane trying to 'find' Thor at the movies end was poignant. She is searching for him just as much as he wishes to see her again. And, in The Avengers, finding a way to bring him back (which is why I believe Portman will play a part in the Marvel outing) will be more the reasoning for his return. I think Loki's intentions in The Avengers are less about destroying Earth but more about destroying the planet that Thor's lost love lives (high five for alliteration). A juvenile attempt to retaliate against his brother. Thus drawing him out and joining The Avengers in their fight against him and whatever/whoever Loki reigns in to aid in this destruction. Thor knows his brother too well and wishes to stop him or believes he can help him undo the catastrophic mistake he has made in bringing forth the attempted destruction of this realm. But the pivotal reason will be the finding and, ultimately, protection of that who he loves. These will be, i believe, Thor's motives for taking part and less about being part of the team.
This is waffling, fan speculation, brain farting and verbal vomiting at it's highest quality. But it is something I've mused over for the last two weeks. I had to let rip (pffft) and see if anybody else can see where I'm coming from. Or if indeed you had thought likewise.
I welcome all comments (not hideous projected insults directed at one another).
Your Craptain Salutes You!
Apologies for no pictures. This is posted via a phone so if somebody would be so kind...