And that cannot be allowed. Mages policing themselves without any oversight can result in lax enforcement such as Orsino's out of fear for their reputation. Furthermore, there is danger of forbidden magic being legalized. There must be non-Mage safeguards.
Technically Templars will be around but they have no say at all how the circle works. They can intervene when asked by First enchanter or in case of disaster.
How dare you doubt Fiona? She is an elf mage, former slave, turned Grey Warden, cured of the Taint, a dragon king's lover, mother of another, who ran from the Grey Wardens without consequences, became Grand Enchanter and is now a freedom fighter. Have I already mentioned she was your mentor's best friend?
How dare you doubt such a splendidly written character that does not make most Mary Sues sound tame at all?
If Fiona existed in real life I'd go lesbian for her and settle in country side and have a lot wild sex. The fact that female orgasm has no cooldown helps too. But in seriousness she is glorified version of Anders, trying to accomplish the same thing without explosions or anything immoral. Also she has all the characteristics required for adoration, as you mentioned.