Well I can tell you that won't happen any time soon in our galaxy. We can't even get from one end of it to the other within the span of a human lifetime, much less make peace with all the worlds and species we haven't even met yet. And even if we could, there's still many hostile races. Like the Kazon, and the Vidiians, and the Borg. Our galaxy isn't exactly the little utopia that yours seems to be.