Right. No need to destroy any item. You do, however, need to reach Level 60 and complete the main scenario quest "Heavensward." Then Rowena (in Idyllshire) will have "An Unexpected Proposal" for you.

The Level 50 relic weapons remain available if you have interest in using them for glamour but are otherwise not something you should pursue if your goal is actually the Level 60 relic weapons.