Not being controlled is not the same as following the law. I'm pretty sure that even in the divine Leliana world state there will be laws the mages will have the follow. Just what do you think any group of person would do if suddenly, their rights of coming and going, reproduction and very existance were violated by an system? You wouldn't need to be an mage to see outrage and revolt everywere.
If there are laws for the mages to follow but the Templars aren't there to enforce it, what is the point of having them in the first place?
Should the mages simply be trusted to follow these laws? Should we trust them to police each other?
The elves of Denerim would claim that humans policing humans
But we must remembre that the mages were following the law; that is the Circle; until they decided they no longer wished to. Hence the rebellion.
So, we can expect the mages to follow the law except if it restricts their freedoms; never mind that that is the very purpose of law, to restrict individual freedoms so humans can coexist.
So, what do we do? Make the laws more and more lenient until the mages are happy with them? Then the efficacy of those too lenient laws are questionable to begin with.
And there is no one to even enforce those already too lenient laws.