I think fans of the Star Wars EU need to embrace the change that the a Star Trek EU fans had to face years ago, and that is that if your book/comic/whatever does not fit with a story the television or movie makers want to produce then guess which piece of media loses and becomes a "what if" story. I'll give you a hint, it certainly isn't the one that cost millions of dollars to produce.
I have no problem with this, but it still doesn't mean Disney has to "change" or "cancel" things out. They can do their thing and the stories can not match up, but don't tell me it's not canon because "you" say so. Just acknowledge anything post Thrawn isn't necessarily going to fit into Disney's story. It would be impossible to do it otherwise, but Walt's frozen head just coming in and wiping it out, at least in Disney's mind, is a slap in the face.
The EU lovers and haters both need to accept the stories haven't been congruent and never will.