what a load of crap. So in their time Searling, Levine and Roberts didn't have an ear for the dancefloor? They are three of the best of their time. Butch and Andy Dyson, currently considered the top two don't dance either. Should they be discarded for a young un who has an ear for the dancefloor? Of course they shouldn't, there is no younger dj that can even begin to compete with these two and many more besides.
Whether a dj can dance or not, or chooses not too in their old Age is totally irrelevant, as long as they deliver the goods, or in some cases what they have been asked by the promoter then that is all that matters. If not then they shouldn't be getting bookings.