[jonnyhiboy!]

Originally Posted by bluetoon

"I’ll just wait for him and when [Greengrass] wants to do one, we'll do it"
-Matt Damon

Matt Damon Says No More Bourne Without Paul Greengrass « FirstShowing.net

There's your answer.

He's creating new characters and will tell a different story about the parent company behind the murderous shadow government operation Treadstone, which brainwashed covert agents like Bourne and turned them into ruthless killers. I'm told the new protagonist will be another agent and probably a killer who went through experiences similar to Bourne's or the character played by Clive Owen in the original Bourne. The plot accepts everything that has happened in the trilogy and factors it into the storyline. Because Gilroy isn't replacing Bourne with another actor, he has made it possible for Damon to eventually return for a big paycheck reprise.

Matt Damon Won’t Star In 4th ‘Bourne’; Tony Gilroy Introducing New Assassin; Why Damon Could Be Jason Bourne Again – Deadline.com

Interesting.

Thanks. Thats what it was, he is hesitant to come back if Greengrass doesn't direct. I don't see what the fuss is, i thought the first one was the best and it was directed by someone else. The second was very good, the first was just so great. Wasn't fussed on the third film tbh. Surely he'd still come back for another film though seeing as his character isn't being replaced.