Not versed with the multiverse in the comics, but couldn't the 2 or 3 universes we're involved with merge from that point on? So no previous stories/episodes are negated.
And like Christopher and possibly others have pointed out, Flash has already show characters jumping back and forth between universes, so there's no need to merge for the crossover.
3) DC's Rebirth initiative is slowly making it clearer and clearer that the Flashpoint event did not actually cause the creation of the "New 52" continuity, and the actual cause of said continuity/reality just doesn't fit with the tonal mythos that Berlanti and Co. have set up over the course of 9 seasons across 4 shows, to the point that introducing the thing that actually caused the "New 52" continuity would be a major "jump the shark" moment
While I agree about this just being a rumor at this time, point #3 above is really a nonsensical reason for not doing a Flashpoint based merger. Just because the comics have retconned the cause of the nu52 universe does not preclude the TV shows from using Flashpoint to merge the settings.
That can easily be ignored by the producers.which is now being proven to be a false notion.
Buffy has a sister!!!???
Retroactivity works.
The introduction of Dawn didn't erase 4 seasons' worth of storytelling.
General synopsis
Remember that time when Buffy's little sister Dawn first found out that Buffy is the Slayer? And then when Angel almost killed Dawn, because no one had told her that he'd turned evil again?
Buffy and her friends all have memories about Dawn Summers, yet only Buffy and Giles have discovered those memories are not real. Buffy and Giles are still lacking real answers about those memories. Meanwhile Dawn vanishes without a trace, and the Scoobies have no idea where she is. Buffy will stop at nothing to find Dawn.
And with a competent writer, the same would hold true here.
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