To attain total and utter peace, we would have to let go of things like religion. However people are so sure that there is some man/woman in the sky watching us, that they want others to know about him/her.
Really the only thing that keeps world peace from really coming through is politics, and religion. really if we want to get to the ideal utopia of peace, we would have to have a different mindset from what we have now. we would all have to think the same way, we would all have to portray the same roles...Communism.
I'm not saying that only Communism can bing peace, I'm just saying that as far as i know, it is the only thing remotely close to a true global peace. Even then it still did not work out. So all in all, triple hell no. As long as there is a difference in opinion, it is not possible.
A lot of what the users in this thread have said is true. unless we can get rid of the things that really separate us like a need to feel different, then we will never know peace.