Funny you name Anderfels and try to justify it. Antivia will follow like it always have, Anderfels is very different. Nobles only control the capital, the rest of country is controlled by wardens. Everyone knows that. Rivain is pretty much pro-mage. Nevarra has been always more accepting and could easily follow leliana. Ferelden was already in brink of giving more rights to its mages before rebellion began. The only remaining nation is Orlais who is at the mercy of Inquisition.
The real bottom of the line without calling something that is against your ideal Thedas ridiculous is as long as there is Inquisition everything that happens in Leliana's epologue is completely possible and they already happen since the epilogue mentions months after her reign and everything seems fine.
Grand Cleric assassinated, magic feared more than ever, mages lynched in the streets.
Divine assassinated in the same manner, mages siding with Tevinter, Venatori, Corypheus, the mage rebellion, etc; people accepting mages.
Not forced to tolerate them, outright accepting? Hand holding, kumbaya my Maker?
An authentic Fairy Tale ending and you want to tell me that not only could this realistically happen but it can last?
I don't need to analyze each nation individually, altough I could. A basic understanding of people will tell you it's nonsense.