20. Game Will Still Play in 20 Years’ Time. This one is a toss-up between some iteration of D&D/Pathfinder, since it’s the one burned into my brain these past forty-some years, or Call of Cthulhu. In both cases, the reason is that I have a large stash of scenarios, miniatures, terrain, handouts, and whatever else I might like to take with me to the old folks’ home.
If I had to pick just one, I’d say probably CoC, since they’ll probably assign me to a small, padded room.