What about a time capsule? Stuff it all in a vapor proof container, charge with inert gas and bury it someplace.
I'm a newbie old fart. I have had the same thoughts as you with drawers full of negs, slides and prints and Cd after CD. No children and only 1 niece, never more to come. My feeling is there really is no loss in life; You just haven't experienced the real benefit till after death. My personal stuff, except for whatever family pictures there are, will be donated to the local garbage burning electric generation plant.