I think that a decision to rub out the existence of Mara Jade, Jacen, Jaina, Anakin Solo and Ben Skywalker would be a giant middle-finger to the Star Wars fan community.
Outside the little group of "Original Trilogy Only" die-hards on this and other movie-oriented forums, there is a great community of Star Wars fans out there who have embraced the dozens and dozens of books that have been published since the Thrawn Trilogy.

I do expect some things to be pulled from the EU into canon - which has happened before - , but we don't know anything yet about anything because nothing of Episode VII's plot has been disclosed yet.

I don't expect anyone to care about the specific stories, and about various side characters, though. Also, people wouldn't mind if some details are different or of some of the character traits of the Solo and Skywalker children were different.