As Josh Horowitz notes in his discussion with Simon Pegg, we don’t know exactly what George Lucas intended in his original treatments for Episodes VII-IX. Making Rey’s parents nobodies was right for Rian Johnson’s story, but changing them to somebodies might be right for J.J. Abrams’ story.
J.J. Abrams replacing Colin Trevorrow and returning to close out the trilogy he started puts him in an interesting position to potentially change Rey’s parentage back to what he intended.
It’s tough because without a predetermined trilogy arc laid out before Episode 7, there isn’t really a ‘right’ answer.
As J.J. Abrams is wont to do in his projects, he introduced questions that may or may not have had answers, and even if there were answers, Lucasfilm and Rian Johnson were seemingly not beholden to them.