That will never happen, even in your lifetime!  As many of the governments that "the Hawaiian monarchy" had agreements with, are long gone and those agreeements are no longer enforced or enforcable.

As for all the lands in the Hawaiian Islands reverting back to Kingdom ownership, that's just another fallacy; as there are no "military forces" for the kingdom to use to repatriate it's lands in the islands, from those who currently hold them (own them.)  Then there is the fact of all the "people" living in the islands; as you can't and don't have the authority to kick them out, nor the capacity to feed them, if they stay' as there is no sustainable agri-base to support such a large population.