The existing crest and fragment arrangement certainly contributes to inventory management concerns. While I can’t promise anything at this early stage, moving crests to the Currency tab is under serious consideration and I think it’s more likely to happen than not for next season. Additionally, having players capped on a given tier of crest getting the next tier down as fallback rewards is under discussion.
And yes, I did implicitly reveal that our current tentative plans are that this system will be iterated on for Season Three.