The Inquisition, if not handled carefully, would turn into a monster and bring doom to all the world, the sort that it was built to prevent. Its quick rise to power, reliance on religious fervour, ability to influence and manipulate both church and state, as well its very nature as a religious militant organization, has brought me a sense of foreboding and unease the longer I play the game. How many revolutions and their leaders started out well-meaning, and turned into twisted shadows of themselves once corrupted by power?
As much as I wish it can become a good and effective UN, it is near impossible to do in the social political climate of Thedas. And the Inquisition is by no means led and influenced by solely pure and good people. And even the most well-intentioned could cause loss and suffering when dealing with a society like Thedas, with its racial, magical, and class divides, its horrible record on rights (what is that?), its poor and uneducated masses forced to crawl in the mud (Sera is actually doing a lot better than many of her peers), and its ruling class uncaring (your planet is swarming with zombies, and here you sit with your dresses and your masks, playing political games).
I hope we get the chance to disband the Inquisition in a future DLC, before it becomes a dragon too great to be laid to rest.