I really wish I could tell you yes, but I don't think it will ever happen. There are too many conflicting cultures and beliefs and too many people willing to exploit these differences for their own personal gain. It's too difficult for many people to respect each other's beliefs. However, I think the world can become a better place than it is now and that we still have a lot of room to grow.
Total peace might not appeal to an adventurous spirit. However, if you're talking about wars, I think they will come to an end. Moreover, I expect they'll be a thing of the past within a hundred years - maybe less.
But 'Total Peace?' That means your mind and everyone else's mind would have to be filled with this quality: no tiffs in the home, no arguments between neighbours, the end of all ego-wants and even ego-driven dreams and ambitions. I don't think we're going to see this sort of progress for centuries yet...but one never knows.
And yes, I am optimistic not pessimistic...I don't believe the World Media gives us even a balanced view of world events, let alone the real one.