Read an earlier post he made. A lot of the EU flows naturally from the end of RotJ. He's not suggesting we are told about Thrawn, the Star Crusher, or the Yuuzahn Vong. He's saying things that make sense to have followed in these characters' loves that shape who they are at the beginning of this film. I don't agree lip-service needs to be paid to all of it, and even if it was, his suggestion is vague enough that if you hate Mara Jade or Anakin Solo, you don't need to imagine them having existed. But those that like those characters would hear those references and actually have a connection to them.
I imagine it sort of a small line of dialogue akin to Old Ben recounting the events of the Prequels. EU haters can hear what happened and understand why the galaxy is the way it is and why the characters are the way they are. EU fans will hear it and get a hard on
For the sake of discussion, how else should the EU have gone down? Luke doesn't start a New Jedi Order? Han Solo and Leia don't get married or have kids despite Han's character arc having taken him from a self-centered, selfish scoundrel to a man willing to risk his life and profit for a woman and her ideals? The one and only thing I can think of people not wanting is Chewbacca being dead. That's understandable. But the rest, I don't understand the hate for.
There are ridiculous EU stories. But none of that needs to be mentioned. Why rewrite that 30 year history in some lines of dialogue just for the sake of pissing on the EU. Since JJ is supposedly an EU fan (source?), I wouldn't expect him to allow a rewriting of that history UNLESS the story needed that alternate history. Either they don't mention any of the events between Episodes VI-VII, or they give a vague reference here and there that could be connected to the EU but it doesn't have to be.
For the record, Coruscant first appeared in the EU and it made its way on screen. Did that get everyone's panties twisted? Little things like that shouldn't matter. Having a different capital city planet in its place is just spitting on fans for the sake of it.