String Theory, at 20, Explains It All (or Not)

I am not quite sure that I would really want to know if the universe really is like this:

Our own universe, some theorists suggest, may be a four-dimensional brane floating in some higher-dimensional space, like a bubble in a fish tank, perhaps with other branes - parallel universes - nearby. Collisions or other interactions between the branes might have touched off the Big Bang that started our own cosmic clock ticking or could produce the dark energy that now seems to be accelerating the expansion of the universe, they say.

But if that would be the truth, then it would be. The next question would be that what we would do with this knowledge?