At least a half dozen times, this summer, I have been asked about my cameras by various people who tell me something like, "My [grandfather/uncle/father] left me his camera and I still have it at home."
My stock answer is, "Well, load it up and shoot it! It's not doing anybody any good just sitting in the closet, gathering dust."
Most of those people leave with the gears turning inside their heads.
I think we all need to start a campaign to encourage people to get out their old cameras out and start using them.