Skaters usually do several Olympics. It seems to me that in 2010 a lots of them still wanted to remain for another four year and as a results there is so many retirements/splits now, but the good news is that if all those young ones start now, after the next Olympics it will be less again. Also, in pairs and dance there is often a bigger age gap so that increases the chance that the older one may want to retire while the younger one may want to continue.
Not so many ladies and men are retiring. (I think comparable amount as in 2010).