I'm so sorry that you find yourself here. My W also wanted to end her A, but was unable to do so. I think many people do not understand that affairs are addictive and are just as hard to break as if the person were on crack.
Quote: I feel that it may take some drastic measure to change my wife's perspective on the situation, like me moving out and stopping all contact with her.
That's something that's very drastic and could very well end your marriage. I think you have several things you could try before you get to that point (and I write that as someone who kicked his W out).
First of all, have you read Divorce Remedy?
The LORD is near to all who call on him, to all who call on him in truth." (Psalm 145:18)