The question raised at the end of Apocalypse is a complicated one. It was eventually revealed that all of Jacen Solo's actions in LOTF were done to change a certain future he saw. Was this future Legacy? Or was Legacy the future he created? (Darth Krayt hinted that the future was only delayed by Jacen) Perhaps this whole "changing the future" thing is an opening for Episode VII to use? Although if I were a betting man I would say Denning himself probably has no idea what the answers to these questions are, that's no reason not to speculate!