If you are going to start a franchise I believe the second best setup ending to Iron Man’s goes to Bourne Identity. They mention Black Briar in a senate hearing and that’s it. If there’s no further movie then no one knows. But as there (thankfully) are it makes certain to tie all of the original trilogy together.
On a separate note, I am I super excited about Jason Bourne despite never seeing the previous movies in the theater. I really hope io9 continues to cover this movie and provide a review as it I believe his character is as much of a super-soldier as Captain America is, yet not being a comic character this is never acknowledged.
Also Also, Two of the bigger films giving starts to Clive Owen and Karl Urban were Bourne films. I think that also needs acknowledgement.