So, just how awesome was the Warden in Origins to off the Archdemon in a year? Or did we get some kind of cut-rate bargain basement Archdemon?
I liked the use of the spell combos in the book, though. Crushing Prison + Force Field ftw!
Also, I'm not really surprised at the lack of technological progress. Europe degenerated enormously after the fall of the Roman Empire and took something like 8 centuries to *recover* much less start significant development again. Granted, some innovations like stirrups and the horse collar and gunpowder did happen--but many of them came from other places. Stirrups came from Mongol invaders. Gunpowder came from China.
Thedas does not have an "empire" to promote what Isabel Paterson called the "Long Circuit of Energy" (highly recommend her book The God of the Machine)--long distance trade that fosters innovation and development. In fact, it has a lot more material hazards to trading. Maybe not so much plague, but certainly plenty of other disasters. The Tevinter Imperium, with its emphasis on slavery, is in fact a massive anti-innovation, anti-development force. I don't really think Orlais is a good source for a pro-innovation force, either. The nobles have too many prerogatives that are geared toward a lower level of development and that would crumble if the peasantry started getting all innovative and trade-y. Fereldan would be a better bet but their population is too small and their economy has just suffered a major disaster.
That's kind of why I suggest a Ferelden-Orlais alliance would be a good thing. It would be a big step toward cracking the power of the nobles in Orlais and freeing up their status society toward something a little looser and geared toward trade and innovation. And Fereldan would have aid in economic recovery that wouldn't depend solely on its own resources.
I think the thing with the Fifth Blight is that it didn't have time to build up steam. That, and the Warden got extremely lucky. If Felemth hadn't saved the Warden and Alistair, Ferelden would have fallen. If Riordan had missed his jump onto the Archdemon's back, it is unlikely that the Archdemon could have been forced to land.
I agree with your comments about innovation. Europe had an awful backslide after Rome fell apart, which wasn't helped by things like the Black Death. The common idea that the Middle Ages were absolutely filthy comes from the fact that after the Black Death, people stopped bathing, because they believed that it opened the pores and let in disease. Before that, people still used old Roman bathhouses sometimes.
My only complaint with your statement is that it was the Avar who brought the stirrup from Central Asia to Europe.
I think part of the reason for Thedas's stagnation is magic and the fear of magic. Healing with magic, for example, is much faster than healing with traditional means, and as such, there hasn't been much advancement in medical science in Thedas. This isn't helped by blood magic creating a stigma against research into anatomy.
Another thing is the Blights. It's hard to foster much innovation when you have a disaster on such a scale, plus the fact that advances could be lost.
As for countries that could serve as a starting place for a Renaissance-like event, I guess the Free Marches might be a good option. Antiva, as well, since they have the sort of wealth that would be needed to patronize such a thing.