Fran I don't know what dance floor you filling with that I had to turn it off after 2 min......interesting but in no way the answer...
times are changing in music worldwide...get on board.
That is why you missed the point again!!
If you listened to the video you can actually know why they could fill a floor (No I am not talking todays unhummm music, but good music written by talented composers)
Listen further to some Oscar tunes, and if you don't think a trio could command a dance floor.. I don't know what I can say.
Maybe that is why as you say there are no arranger players on stage.
"get on board".. not I, "pop" music is not my cup of tea..

Maybe you should just DJ, and you have the answer.