I commented on this very subject yesterday and would say ..
It is rude and very unprofessional to cut a record half way through when someone is Dancing. They have paid their entrance fee and are entitled to Dance if they wish to. If it is the case where we remove discs that don't get a full floor where do we put the level before we lift a record - 2 maybe 3 people dancing ?? You should play a record through irrespective of the floor, should it be empty or full. Often get more feedback from a 'quieter' record than a floor packer. We are at an age now where the majority of visitors come to listen rather than Dance !!
You will get a lot of response to this tread stating that if, in the past, we lifted a record because of an empty floor we would never here anything new ( or conversely really old !! )
Have faith in yourself, the music is appreciated despite the lack of foot movement !!