Though the entire EU has technically turned to legends the stuff that will immediately be wiped out by new canon is the post ROTJ EU. The pre-ROTJ EU is still technically safe for head canon purposes (without much in the way of new canon interferring with it) for the time being. So how long do you think it will be before Disney decides to go into the pre-ROTJ era and start telling stories there and wiping that slate clean as well. I have a feeling Disney will be completely satisfied with creating their own new universe in the post ROTJ era for at least the next ten to fifteen years. Rebels doesn't really interfere with much previously established EU and after Rebels there will likely be a television series set inbetween Ep VI and VII to give their new characters backstories. I think even after the ST is complete there is a very good chance Disney will do a fourth trilogy set after the ST. Once that fourth trilogy is finished in my mind is when the urge to start jumping around into previous eras may come about. Of course I guess there always will be these standalone films that could jump into those eras before that. And I guess this thread could go in either lit or here.