I have read about coin collectors thinking about the same thing my opinion is Make a list of some resources that can guide the ones that will be dealing with your collection Value, Types, Makers, or encourage them to hold on to them until your grandchildren can appreciate them if not leave them with some information on where and how to maximize unloading your collection. On the other hand when the time is right sell them yourself that way you know they will be passed on to other collectors to preserve and enjoy then you can use the money to do with what you please.