The press release had all the compassion of a multinational corporation. Fine, I've conceded to expect as much. Substantially though, I don't see how this is much different than the situation with the prequels, where George told his story and the EU adjusted. There's only so much damage that can be done in a character-driven film. Not much of the EU was affected by the prequels - granted, the timeline was held in reserve prior to their release. With the sequels, they can change the labels of canon on the Holocron, but can't erase millions of fans' perceptions of what constitutes the GFFA. They're not going to say "Thrawn never really happened" in the opening crawl. I would expect that it will become apparent that the Solo and Skywalker kids no longer officially exist. That throws off a lot of story arcs - Young Jedi Knights, New Jedi Order, Legacy of the Force - but does little to the Thrawn Trilogy, Dark Empire, or anything else that pertains to the GCW setting of PR. Based on the information we know now, I'm not worried about the implications of 34 ABY.
The ships and locations in SW: Rebels TV series will be a lot more on-point for purposes of the mod.