Yes, the draft has not been used, but it is still an option on the table. That is the point of the selective service. It registers all applicable to be drafted in the event a draft is required.
Any party that re-institutes the draft in this day and age is signing their own death warrant. It will never be used again. Today, registering is just another tool of big government to maintain control, much like the requirement for babies to be issued a SSAN.