Veruin wrote....
I always thought mudanes were like tranquil, effectively invisible and undesirable.
I'm not sure if this has been responded to or not since I'm playing catch up on the pages, but I'll respond to it anyway.
This is not true, and it can be proven by talking to the Sloth Demon in the mage origin. He talks about 'dreamers,'not meaning Somniari who can enter the Fade freely, but regular mortals who fall asleep and dream. He talks about how demons and spirits can see the dreams of these mortals, and I think somewhere it's written that they sometimes influence those dreams.
However, the difference between a mage and a mundane is that mages naturally have more power than mundanes, and they have the capacity to enter the Fade aware and conscious, compared to those who simply dream. Their power and their awareness in the Fade itself draws demons to them, making them the much more sought after prize than the mundanes.
The Sloth demons makes it clear that you entering the Fade aware for your Harrowing roused his interest, as well as the demon hunting you, and he was inclined for 'a meal', meaning you, so he can see the mortal world.
If the world suddenly had no mages, or all mages were made tranquil and cut off from the Fade, aside from no more Grey Wardens to fight a blight or mages to combat Qunari technology, it's not unreasonable to think that demons who want to experience the mortal world would turn their attention to the mundanes they had previously ignored in favor of the mages.