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And the whole pro templar argument that mages cannot rule themselves is long discredited with the fact that the tevinter society exist ( who is not nearly as corrupt as we once thought btw) if the tevinters can build a stable society then why not the southern mages?
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As pro-mage-freedom as I am, "stable society" isn't necessarily a strong argument - and Tevinter is an awful example. Yes, it's stable. Yes, it has considerable power even long after it's fall from the world-shaking power it once were. No, we wouldn't want something like that.
Also, Circle system was relatively stable and Qunari system is relatively stable - pretty much every system that exists, from Tevinter (mages uncontested for power) to Rivain to Chantry Circles to Qunari (mages effectively denied status of people) - each and every of these systems proved to work. Each of them is stable enough to last literally centuries if not millennia with relatively minor adjustments and changes. The youngest of them (Circles) is twice as old as Ferelden as a unified country.
My opinion on Circles (understood as they were up to this point) isn't that they can't work. It's that they should not be allowed to work. I believe the system to be as rotten as Tevinter, completely disgusting both in practice and in theory and very wasteful - mages are undertrained, benefits of magic unavailable to society at large, magical research hardly exists at all, and all kinds of magical incidents when they happen are a "great surprise" nobody can really deal with appropriately. Templars have their training but prove to be hardly adequate with their limited powers while mages, on the other hand, are kept completely in the dark since any serious, objective (that is, allowed to question Chantry dogma) research on matters like spirits has halted long ago, not to mention academic study of Blood Magic that - if pursued - could likely allow at the very least replication of Litany of Adralla, an already existing solution to many abomination- and blood magic-related problems... if only Circles managed to replicate it! But it's not only not replicated, but apparently kinda out of grace - imagine how many lives could be saved in Fereldan Circle if Knight Commander had it on him and understood its value right from the beginning. But it's connected to blood magic, so it was apparently locked somewhere and forgotten by most people...
Circle system is repulsive and has a really steep price for its limited advantages, but (as I said) it's not - by its nature - unstable. And the worst abuses were, in fact, abuses of the system rather than its integral part. And a couple centuries of any system are bound to breed some abuses - sometimes they are dealt with as they appear, sometimes (when more elements of a system happen to fail simultaneously) they are not and system collapses. But such a collapse doesn't mean that the system can't be more-or-less re-created if appropriate people deem it appropriate course of action and are willing to make adjustments to get rid of immediate causes for the collapse as well as some a bit deeper hidden roots.
Oh, and one more thing - there's no saying how stable modern Tevinter would be if not for Qunari. From what we hear it's highly dysfunctional at this moment, but so it happens that mages are the main weapon Tevinter has to offset Qunari dominance at other fields (namely, non-magical technology). This keeps Magisters in power. I wouldn't bet they would last long if Qunari were to disappear... It's not untinkable that winning the war now would end up with collapse of Tevene society. Even now we hear of slave revolts once in a while...