"We definitely want to make Crysis 3," he admitted when asked about mapping out Crysis as a trilogy. "I'm not making a formal announcement. We'd like to make Crysis 3 but the second game needs to be successful first. I will mention that there is a plan for how the fiction of Crysis should roll out, but again, it depends on the success of Crysis 2."
He added that if Crysis 2 doesn't meet its goals "for whatever reason" and doesn't even break even, then there may not be a Crysis 3. "But if it sells anywhere near what [Call of Duty] Black Ops has, there may be more from Crysis," he added. Given that he previously said that 3D would be a native trait in the next four Crysis games in the franchise, the current wait-and-see approach seems a bit more reasonable.
From: http://www.tomshardware.com/news/Crysis-Crysis-Trilogy-Cevat-Yerli-FPS-Black-Ops,12080.html
are you kidding me? At that time Black Ops sold like 15m copies on multiplatform. Crysis only sold like ~1,3m copies since it's released. Even Homefront (the worst Shooter EVER!!) sold more copies than Crysis 2.
Crytek I wish I had your optimism ..