Could We Ever Take Advantage of a Time-Warping Black Hole?

Conventional wisdom, namely Einstein’s theory of general relativity (the best theory of gravity in town), predicts the presence of a singularity at the center of a black hole. It’s a point of infinite density that lies outside the bounds of our normal spacetime.
However, this prediction of a singularity does not necessarily mean it exists. Singularities tend to pop up at the very boundaries of our understanding — like inside black holes and at the Big Bang — and at the intersection of general relativity and quantum mechanics.
On the other hand, theorists working on a way to marry quantum mechanics with general relativity have suggested that something else might be going on at the center of black holes: Instead of forming a singularity, matter and energy may be sucked in and then spat out at some time in the distant future.
Yes, that's right, a time machine. Sort of.