That would be neat, except Spider-Man 3 takes place 3 years after SM 2.i would be cool to see spidey swinging at the end of the film, then he swings past the docks and the camera stays at the docks as we see spidey swing off then the music goes from cheery happy end music to lower worrying music (Think Spideman 2 final scene with MJ) and we pan down to the edge of the docks looking over the water. then doc oc's tentacle smashes onto the ground.
Credits roll