I'm not optimistic. When was the last time Blizzard turned around an obviously overused character by exposing them even more? She needs a break from the story, and Malfurion is both a less annoying character and just as strongly linked to the Green Flight as she is anyway, if not moreso. Khadgar is a good example, he was there for two expansions, put in the freezer for two, now people are mostly glad he's back.
As for the Horde, Reliquary is an easy opportunity to feature a BE or two. I'd also like Dragonmaw Orcs stirring up trouble if there were any of them that weren't literal whos are this point. Forsaken are likely to see little to no screentime at all unless undead dragons are involved, which come to think of it might not be the worst idea for a patch or at least zone/dungeon for this expansion given that the Scourge recently started running amok again.