I banished them. I don't blame the wardens totally for trying to create a demon army and preemptively dig up and kill the old gods (though who knows, maybe just a warden is enough to turn a sleeping old god into an archdemon, they do after all carry the blight).
But this is the second time the wardens were manipulated by Cor. The first time in getting freed and now this mess that got a lot of good soldiers killed and valuable time and resources wasted. Some were convinced at the last minute to help, and blackwall has been a big help, but the Wardens are too much of a danger against this particular enemy.
I'll admit, I am sad to see the order fall into disgrace, and I sacrificed Strad to escape the fade. So the wardens are leaderless and living in exile. Thats gotta sting to be bond to a decimated disgraced aimless organization. I am curious to see if King Alistar has anything to say about the banishment later on.
To be fair I don't think you will be hurt for keeping the wardens. Most of the time if Bioware offers a secure choice and a risky but well intentioned choice, the well intentioned choice wins out while the secure choice just makes you a jerk and everyone else asking what if.
But I think from a logical standpoint, as a leader and military commander, if you had to raise an army to fight something released by mind controlled wardens and then lay siege to a fortress filled with mindcontrolled wardens, you would be pretty cautious of wardens too.