So, quick point: virtually the entire lyrium trade stems from trade with the dwarves. That's needed by Mages, Templars, and various others. I'd imagine there are a few different solutions to the problem that surface-dwellers come up with, like trying to mine it themselves and having a black market trade with smugglers from Dwarven cities. The Blight lends itself to anyone wishing to dungeon delve for the stuff, but surface-dwellers are still susceptible to lyrium poisoning.

Just a thing that occurred to me while thinking up a plausible dwarf character. Thoughts, great and powerful GM?