Source: Marvel Studios
From :

“If DeMonaco was still involved and they came up with a great idea, then I think I would do [another Purge movie]. Otherwise, I think I’m done. Same thing with Captain America. There’s nowhere for it to go, unless you’re Captain America or Iron Man. They were talking about it, but I was like, ‘You know what? I’d just rather not do it.’ I’m so appreciative and grateful to have been a part of something that big. I’m appreciative of The Purge. It’s become a part of the lexicon and the zeitgeist knows what it is, so that’s been fun. But, it’s time to move on. Don’t stay at the party too long, or you get knocked through the ropes.”

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