Paul Greengrass, director of
The Bourne Supremacy and
Ultimatum, has left
Bourne 4 over script and budgeting issues.
Universal is upset over the re-shoots and expanding budget of his upcoming film
Green Zone. It was supposed to be a small pet project for Greengrass, but it has ballooned to over $150 million dollars. Script issues with
Bourne 4 has also upset Greengrass.
Matt Damon has said that he's loyal to Paul and would only return to the series if Greengrass went along with him.
Source
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Maybe the director of
The Bourne Identity, Doug Liman, could return. I'm sure that Damon would come back for a big enough paycheck. I thought that the ending of
Ultimatum wrapped the story up well, but I'm game for another one if the story is worth telling.
Green Zone, which also stars Damon, might be the closest thing we get to seeing another Bourne film.