Some of my regular readers may be shocked when I say I think Seabourn went too far in this instance. The couple in question were doing back-to-back cruises and had already attended the muster drill on the first segment. They were also in the same cabin and had the same muster station for the 2nd segment.
Giving them the heave-ho was excessive and I think mostly a knee-jerk response to the Concordia disaster. Plus the husband did go to the 2nd drill, so why not just handle the situation with his wife with a one-on-one drill later if they thought it was so vital? Again, it wasn't as though she had not attended a drill, just not 'this one'.