Board Thread:Questions and Answers/@comment-5221278-20140102183646/@comment-4651179-20140102195131

Age of Ultron caused the multiverse to suffer a serious deterioration. This caused numerous rips in the fabric of the universe which caused some characters like Galactus or Angela to be transported from their universes to the Ultimate Universe and Marvel Universe, respectively.

The causes of what happened to the Living Tribunal are still unknown (might be because of this), but the responsibles of New Avengers (Hickman or editor Tom Brevoort) are not even telling us if he's dead or agonizing.

Even though time-travel causes divergent realities, it seems each time you travel in time, the Multiverse wears down a little insignificant bit. And possibly the Age of Ultron time-travel was the straw that broke the camel.

Or maybe time-travel doesn't actually wear down the Multiverse, but in Age of Ultron it did because they even travelled back in time to a divergent reality to create a divergent reality.