Getting rid of selective service registration seems like the best outcome. In the case of need for the draft again, we could implement it without the SSS. There's also the weird problem that a truly existential war which would otherwise justify the draft is also the kind of war which would likely escalate to WMD and thus make the draft irrelevant.

My preference is, in this order: 1) No draft 2) Universal draft registration-only 3) Universal draft and national service of some form 4) Male-only registration-only 5) Female-only registration-only 6) Male-only universal draft/service 7) Female-only universal draft/service