He has to picky then and I suspect he will be considering how both Anders and Justice were against blood magic. Also I think psychotic blood mages are executed most of the times as are most maleficars.
And honestly we haven't heard how uncontrollable cured tranquil's emotions are and how long it lasts.
So, it will fall upon Anders to decide who gets and doesn't get to be "restored"? Can you imagine the ethical concerns and conflict that will raise?
Imagine if someone with the capacity to bring the dead back to life appeared in our world. Imagine the chaos that would cause as it would be announced that this one person will decides to is and isn't brought back.
And of course, even if restored mages are able to control their emotions, many were made Tranquil because they can't resists demons. Being restored won't make them able to. And now, there is not even a Circle to contain them.
What's preventing 90% of these restored mages from becoming Abominations?
Actually I believe that the best philosophy ever about Magic in Thedas is: "With power comes great responsability." A bit spiderman but very true. (Except if you want to make a purely evil playthrough/tyrant.
I like the idea & philosophy of the Jedi Order, they have powers (the Force) but still able to restrain themselves (mostly) and even be the guardian of peace. Why can't we try to build something like this in Thedas? Most blood mages I see in Kirkwall is actually using blood magic out of desperation. Why can't we have both templars and mages works together as partners to monitor closely each other but also as guardian of peace to Thedas?
Because Star Wars is not realistic, because Star Wars has technological weapons capable of destroying planets and because Star Wars has had multiple Sith Empires.