I think we can use it to go back to a place. It is the same as going further just that now we “just” need to shrink the space. Of course all is so far just an exercise of our imagination.

You can take a look at the curvature or more concrete to the density of the Universe. It is possible to be positive and in this case at one point in the future the Universe will collapse back on itself. Nothing will stop it to do this apparently FTL.

Unless we create a link between two points nearby ahead of time, wait for a billion years and then use this link to jump between the two points. In fact, I think that such links exist everywhere between any two points in space, but they remain latent in the form of quantum entanglement.