Hmm good point. So what could happen is that lifestream gets taken away, and planet is left as just a barren wasteland. Perhaps.
But it would make sense for Sephiroth to at least partially 'win' this time, since if he doesn't, then the whole time travelling would be a pointless addition to the...
This is an interesting clip of Cloud and
Sephiroth talking in an astral place: 'Edge of Creation'. Having watched it, my theory is as follows:
'Our planet will become a part of it someday.'
'Let us defy destiny...together'
In Remake, Sephiroth will defy destiny and achieve his goal, at least...