Originally Posted by
idisestablish
It seems to me that everything that happened in the past still happened. When Battleworld was created, it was made to look and feel older than it was, and people were given false memories. Nothing has demonstrated that time has actually been rewritten. Battleworld is held within 616 Eternity (as seen in Silver Surfer), so it seems that Battleworld is contained within the Eternity previously filled by what we know as 616. The Beyonders have been explicitly stated as being completely linear, so the destruction of the multiverse occurred at a certain point in time, ending anything that came afterwards, but each universe was not destroyed throughout space-time, so anything that occurred previously should still be in place, thus permitting time-travel. Battleworld was shown to have been stitched together inside Eternity, who had been placed in a void outside of the "space" that 616 occupied. Time travel to a point in the fabricated version of history Doom implanted would not be possible, since those events did not actually occur.
So, you can theoretically time-travel to any point before the destruction of 616, but if you are there at the point in space-time that it was destroyed, then you would be destroyed as well, unless you are present within the portion of the universe that was carried into Battleworld. After that, the timeline for the portion of 616 that survives continues into Battleworld from the moment it was actually stitched together. Same with other timelines like Age of Apocalypse. It continues as it did up until the point that Doom ripped it, at which point, the timeline carries on, for the portion that was saved, in Battleworld. So, if you are traversing from a time before the destruction to a time after the destruction, you would need to travel through, not only time, but space because the "space" the timeline picks up is different. Think of it like someone moving Earth, if you time travel past the point it was moved, you would just be in empty space if you didn't also travel to the location Earth was moved to. Except, as demonstrated, anything in that "space" after the collapse of the universe would be destroyed. Since we don't know how the rest of Secret Wars will unfold, it's unknown how many or what universes will be re-created after it ends or how they will be created. We do know that the mainline universe is being created by Silver Surfer, aided by the Shaper of Worlds. It, like Battleworld, will probably be made to feel older than it is and like a continuation of 616, but we still really don't know how it's going to play out and if the "patch" of 616 in Battleworld is going to be transferred there or perhaps just some inhabitants of Battleworld will choose to relocate there, or what. So all we can really pin down from a time-travel perspective is everything before the universes died is the same, and there is nothing after except for those places stitched together to form Battleworld. My best guess is that the timeline will follow as normal from 616 to Battleworld to Universe-8, with everything being moved through space but in a linear timeline, with multiple realities converging during their respective timelines after they became part of Battleworld.