When I saw the hand dancing video below, my instant response was brilliant.
It seems like it has everything needed in order to be the next trend: low tech, serendipity, rhythm, humour, musicality, minimalism in movement towards maximum of effect, quirky... can't stop, but I think it would be just as much fun creating a coreography as it is to watch. I can also imagine that each routine, like tap dancing, would look uniquely wonderful.
My daughter, on the other hand, was not enchanted. She says it looks too strange. So, time will tell whether hand dancing will go viral and become the next trend on YouTube.