I'd like to make some speculations - what if or if it's even possible. First, I know that Ritualists were capable of summoning powers of their ancestors, yet Revenants are (theoratically) more powerful in this aspect. They commune with demons (Mallyx), centaur spirits (Ventari), charr legends (Kalla), human legends (Shiro), dwarven legends (Jalis) and the dragon (Glint). This seems pretty strong from a lore point of view. As for Mallyx, he was a servant of Abaddon, one of his greatest. This might mean that we are kind of using god's power a bit.
However, are we capable of summoning powers of Balthazar? Ritualists were tied to their ancestors and in this case it would make perfect sense as it's The Six who brought humanity to Tyria. Technically this makes them their ancestors. As we know, every human can summon lesser powers of The Six (the racial skills). With Revenants having far more vast control over connecting to spirits they might be able to somehow commune with so-called divinity of Balthazar as he is no more but his power still remains - Aurene / Kralkatorrik.
I do know how PoF ended and I think that this is a very interesting concept. Balthazar is the past now - Revenants aren't able (or just simply don't do it) to summon powers of spirits that are still "alive" - not in The Mists.
What do you think? Also, should Hounds of Balthazar racial skill change after PoF?