They disfellowship people who HAVEN'T had sex but have stayed under the same roof over night when they see fit, (yeah like no one has sex during the day ... ) because of appearances.
So using that level of awesome logic then it would follow that consumation of the marriage mean diddly squat as regards anything in WTBTS land. After all appearances are everything, so people know they were married, people assume they had sex of some sort at some time, ... tricky proving a negative and they dont take anyones word for it unless it suits them.