Amen to everything the Oracle said. (An appropriate name in this instance.
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I've got some notion that the lyrium is either what's left of the Titans, or what fueled the Titans themselves. They're definitely dropping giant hints about the old song.
Old Song: Templars and dwarves, with the common link seeming to be lyrium.
Blightsong: The 'dead whispers that want the door opened', as well as Red Templars. Presumably, the same Calling that Wardens and darkspawn hear.
What's curious is we hear lyrium described as the Fade itself made manifest. Odd that the dwarves with their affinity for it don't connect, and that the Templars use lyrium to connect to the 'other thing'. And lyrium is described as living, which has all sorts of disturbing implications for the Fade, especially since we're starting to see red lyrium there, and there's the Whispers in Red Lyrium Codex entry to worry about.
The statues in the Western Approach's Codex, the Transformers shout-out, mentions the giant looking for 'the blood of the world', with the Tevinter assuming he means lyrium. But Yavana uses it to refer to dragons.
Solas's metaphor is curiously specific. The 'Now I know why I didn't see the dwarves' is seven kinds of alarming. Whenever he went into hibernation, he expected to see the dwarves' dreams. So it would seem whatever cut them off from the Fade happened after.
I'm starting to suspect Gaider left DA to work on the new IP because he wanted to enjoy stringing fans along and trolling us, and have other writers handle giving us the answers he's been hoarding for years. 