I mean, the new timeline thing is something the fandom's been talking about for years (and thanks to Rebels there's even an in-universe mechanism to introduce it), but that's a long way from Disney caring.
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As an aside, I had a theory (which is mine, and what it is too) that the climax of Luke Skywalker and the Shadows of Mindor (in which Lord Cronal/Lord Shadowspawn/"Agent Blackhole" is discorporated into hyperspace) would provide an in-universe explanation for the Legends EU being replaced by the current post-Endor novels timeline -- his spirit saw time, and reworked things into a more entropic pattern, as befits a former Sorceror of Rhand....I mean, the new timeline thing is something the fandom's been talking about for years (and thanks to Rebels there's even an in-universe mechanism to introduce it), but that's a long way from Disney caring.
Alteratively, for the brand, go backwards, WAY before the High Republic stuff and tell the stories of how the Jedi rose up along side the republic and the past involving the Sith, but instead of telling the story from the point of view of a Jedi apperntice, do so with a Sith appentice, see the other side of the coin, so to speak!