Right, there are plenty of instances of mages doing fine without circles, and then instances of mages becoming abominations and killing everything around them without circles.
It's not a black and white answer to a very complicated problem.
And instances of the Chantry controlled Circles leading to abominations as well. That's what makes it such a divisive issue for so many people who feel strongly about it, one way or the other. But I feel most people made up their minds some time ago about where they stand on the issue.
As for the original topic, perhaps Dagna might be a love interest for players who are looking for a romantic interest without any ties to the Chantry, as Maria suggested earlier. Her interest in the Circle was academic, she would be the first female dwarven love interest in the history of the franchise, and she is making a return in Inquisition.
If Ariane is among the Dalish in the Dales (which is pure speculation on my part, but I'd imagine she could be tied to Morrigan's "gift" from the conclusion of "Witch Hunt"), it's not inconceivable that she might also be a love interest, or someone playing a similar among the People (especially if it's possible for the player to side with the elves instead of the Orlesian nobles vying for the throne).