Black,
Although negative energy has never been observed, it is still, in theory, quite plausible. Mathematics is our best evidence for it. We know it exists; we just can't find it. I'd say that, in time, we will eventually discover it and unlock new vistas of science previously unknown.
Traversing the universe would be quite a difficult thing, indeed. One of the newest ideas on getting from Point A to Point B in a short amount of time is opening a wormhole.
Think of it like this: a piece of paper has two points drawn on it at equal distances from one another. Instead of trying to directly travel to Point B across the paper, why not simply fold the paper to shorten the distance there? It's a good idea that's still in theory, but it could very well become a reality someday.
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