Bourne's Identity Revealed in "Ultimatum"
"He will by the end of this one," Damon said. "I don't know how long we can ride that pony. Maybe he'll get a bump on the head at the end or something."
There were originally three books in Robert Ludlum's series, though the movies have strayed far enough away that the possibilities are endless. Still, Damon thinks three should be it.
"We have a story and we have a story to tell, but looking at it, to be fair, we go, 'Okay, I think this should be the last one' because I'm half joking, but how long can you [revisit it?] His search for identity is definitely going to come to an end."
Answers don't always provide the solace that Bourne is seeking, and even Damon isn't sure he'll like the answers in Ultimatum. "I don't know if that guy can ever be happy."
Damon continued to joke about the possibilities of a fourth film, in a "Rocky Balboa" sense of tapping the well 20 years later. "I would love that. If I'm like 100 pounds heavier, 'They pulled me back in! They won't let me go!' They're like, 'No, we don't give a sh*t about you. What are you talking about?' Yeah, I think that's actually probably the only way to do another Bourne movie would be to do it 20 years down the road."