This is THE most important consideration. The questions about linkability above make a big assumption that the data in GRBio will always be correct & that the very fluid, hierarchical relationship(s) between institutions, collections, and people are updated in near real-time with date stamps. It might help to think of basic use-cases and what are the drivers to ensure metadata and relationships are created and maintained.
(1) What happens to people records in GRBio when someone changes institution? Dies? Shares multiple affiliations?
(2) What happens to collection records when an entire collection changes hands or heaven forbid is lost or destroyed?
(3) What happens to institution records when the institution name changes or is split?
I bet most of what we want can be accomplished in WikiData even if not now populated to the equivalent density as GRBio. As Rod says, WikiData enthusiasts can populate and repair these in a real hurry. However, there will be other data elements unlikely to appear in WikiData such as people profiles, contact information and their relationship(s) with either collections or institutions. If that is to be accomplished on GBIF proper, what is sticky enough for them to do so w/o question or fuss?