For me disbanding seems the only acceptable option, but my choice is a little biased, since my first playthrough in DAO was as a mage, and my head canon for every main protagonist is that of a mage, race and sex varying from game to game.
Since my mage happens to be a Libertarian, or never under Chantry control to begin with, there is no way in hell/void for him/her to go back under Chantry control, even if you like the current Divine. As the saying goes, Divines come and go, but religious zealotry and racism lasts forever.
The fact that if you can find out after your choice that the next game is in Tevinter(either spoilers or previous playthrough) is another nudge towards disbanding, because there is no way in hell the Vints will allow Chantry troops inside their borders, no matter how dire their situation might be. If you are leading a ‘mercenary’ band with experience fighting Solas/Qunari on the other hand, they might even pay you to join them. Win win. Also less chances of spies and Chantry stooges with veto power regarding your choice of action can’t ****** you off or control you in any way.
And let’s not forget the Jaws of Hakkon DLC, that also gave you a hint of what the future might hold for your order if you decide to join the Chantry. And by ‘gave you a hint’ I mean it hit you in the balls with a sledgehammer. Repeatedly.
So, the last Inq of the previous Inquisition happens to be an elf mage that is also the leader of the Seeker of Truth order, devout follower of both Andraste and his Creators, who sacrifices his life to protect Orlais against a threat that could have destroyed the country.
To honor his sacrifice, the Chantry then decides to remove him from history, change the Chant of Light by removing the verses that were depicting the elves as heroes who helped Andraste, start a Holly War against the elven homeland, force a big part of them to forsaken their gods and follow only the Maker, and scatter the rest to the winds.
Not only that, but the ones that decide to follow the new religion are treated as pariahs, third class citizens or even slaves, even in Orlais, a country that claims that they have no slaves. Let’s take a look at Fiona’s bio for example. From an alienage in Orlais, orphaned at the age of seven, bought as a slave by a Count and viewed as a pet, sexually and physically abused by said noble. In a country that allegedly has no slaves whatsoever.
And let’s not even touch the mage lifestyle. Let’s just say that the elves in the Alienages have a better life. At least they can have a family and keep their children. Except Fiona and the rest of the elves that are unlucky enough to also be a mage besides having pointy ears. Those really won the lottery.
If he somehow found out about this, I’m betting Ameridan would have been pissed. Royally so. I bet he would have released the dragon, ride the damn thing himself and proceed to burn every city in Orlais, starting with Val Royeaux and that shinny Chantry.
I don’t know how many games are left in this franchise, but I hope the last DLC is taking place like 1000 years in the future(or as long you can advance and still have swords and stuff). You are a spirit of the last hero trapped in the Fade, and someone manages to set you free, Cole style. Then you can admire the future you helped build, or, if the people of the future managed to screw up all your good work, kick their ass and start pointing them in the right direction again.