I don't think Ozy's peace will last. It is inevitable human nature and aggression will replace unity as time passes.
Now, upon first reading I like to think that the peace is broken by the journal and Veidt gets devoured alive.
But it would be for the worse and in reality it is unlikely that it would happen so clearly. New Frontiersman is mostly a conspiracy nutjob paper and even if they prove that it is Kovacs who wrote the journal, he'll be lumped in with them. And the mainstream media will write it off as a conspiracy theory, similar to how no one believes that there was a shooter on the grassy knoll (and in Moore's version of history there obviously was) and that the government assassinated Woodward and Bernstein.
Likely, no one will believe that report or those that do will be fringe right-winged people similar to Rorschach himself or leftist conspiracy theorists. However, it will cause people to start questioning the "world peace" they have and it will inevitably collapse upon itself.