Heat death · 5:06am Feb 3rd, 2017
Scientists still don't know for sure where our universe is going. And, unless magic results from currently undiscovered forces, Equestria's universe clearly differs from our own. But the current prevailing theory for the end of our universe is heat death: energy equally distributed everywhere. Absolute order. Maximum entropy. The universe will end cold, lifeless, and eternally inert.
Now he is a fan favorite, but let's be honest: in the land of Equestria, Discord is pretty annoying. Even though he's "reformed", he's not entirely nice. He still enjoys chaos for its own sake, creating disharmony for lols. You certainly wouldn't want him as a neighbor. And yet, his ability—and desire—to reduce entropy, to turn order into chaos... could make Discord the savior of the entire universe.
(This was just a random thought I had and wanted to share. If it gives you inspiration for a story, go for it! You have my eager permission, and I'd love to see what you come up with!)