It is certainly up to the owner to determine where his or her collection will go. In that most museums don't want beads, it might be best to pass them on to other collectors. I should point out that much of what Corning has in the way of beads was purchased in the 1960s and 70s by Alastair Lamb in West Africa so not much background on that material. As for archaeological beads, those excavated by universities, museums, and other organizations generally remain with the funding organization and may or may not be accessible by researchers. Beads from looted archaeological sites are less useful to researchers as they lack chronological and cultural contexts but can still provide information. In any event, beads were made to adorn people and their possessions, and not necessarily end up in museum collections.