Originally Posted by KalMart
And her function is done. You could easily have Thor come to Earth again for another purpose entirely, not even mention or see her, and nothing would feel unfinished. Oh...she was a 'love interest'. Right...how memorable was that?
Technically, sure you could point to how important she was in the actual plot, yadda-yadda. How did it feel, though? Was there electricity? Like we have to see where the relationship goes or something will feel lacking? That's why she's interchangeable.
If Jane doesn't return it makes the ending from the first movie pointless.