It is a bit early for that question right now.
For now, the Creator template in Commons can not be replaced with Wikidata. There is no way to integrate data from Wikidata in an arbitrary Commons page (which is what you would need in order to replace the Creator template). We have a Bug for ( this
https://bugzilla.wikimedia.org/show_bug.cgi?id=47930 ) and aim for this in this fall / early winter to be completed.
My assumption would be to, for the long term, create the Creators as items in Wikidata (if they do not exist) and add data to them. But this will not yield any short-term visible results, which is frustrating. So you might want to have a double strategy: add them to Wikidata and add them in the creator namespace, just as you have done so far.
Does anyone have another opinion on this?
Sorry for not having better news right now,
Denny