I'm not sure why everyone assumes that EU characters can't be used because it will be too confusing to non-EU fans. Everyone survived the prequels just fine with basically all new characters. I remember leaning over to my husband in the theater and saying, "who the hell is Grievous?", but I survived just fine. I'm sure most movie patrons will suspect that the characters continued to live their lives between episodes 6 and 7, and that stuff happened I think it would be more strange if the movies picked up with Luke, Leia, and Han with no marriages, no kids, nothing.