I don't think there can be any guarantee that exposing the A will help extinguish it. Due to outside pressures from friends and family this could happen but it could also help validate their 'love' for each other, pushing them closer together.
As far as admission don't expect it anytime soon. When I finally confronted my W with proof she was relieved. She was glad that she didn't have to keep it a secret anymore and it was a huge weight off her shoulders. Sometimes wish I had just let it go back then and let it wear on her...
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Me: 39/W: 37 D13-D11-S8 M/T 14/20
EA confirmed: 9/13/07 D-Bomb: 9/19/07 OM Gone since 12/18/07 W wants to fix marriage: 3/16/07