Originally Posted by
Iscah
That's not rejoining, that's overwriting timelines - only one version survives and the other is "thrown out". And you're only thinking about the Source, not the shards - we've seen that the worlds aren't identical copies like that. The differences are far greater than "character X died on the Source but survived on the First" - entire civilisations are different.
Additionally, replacing the Source with "a version of the Source where the Ascians never existed" is near impossible. They didn't just cause the death of a few people we like; they're entwined through all of history. The Allagan Empire might not exist; the Garlean Empire would not exist; the War of the Magi well might have been their doing. The Sundering itself might be erased.
This is an entirely different issue to the Rejoining ofthe current worlds, to say the least.