I say have them bring back the requirement that the couples do the specific moves of the dance. I seem to require that they did this in the beginning, although it may just be wishful thinking on my part.
Kind of like in the Olympics, most of the judged events have specific required moves that the contestant needs to do, with points docked automatically if they aren't done.
This would keep the Pros on the straight & narrow with their choreography & give some basis for the judges' scores.
This would also probably require some new judges, ones that actually know the dances.