I have a fairly extensive gaming library at my disposal. Assuming I don't leave the hobby (highly unlikely) or get a job overseas and sell the majority of my collection (somewhat more likely, though still day-dreamy pie-in-the-sky), I'll be running at least some of these games as the years pass by. I'm sure I'll be playing Star Wars in one incarnation or another, or Cyberpunk 2020, or (old) World of Darkness.
This also makes me think back to the games I was running twenty years ago. Cyberpunk was probably the big one for me back then. I used to love me some horror gaming with the Chill RPG (and I'm still tempted to dust that one off from time to time, too).
Note that yesterday I got my copy of the 5th edition Player's Handbook, and it's looking pretty slick. It retains much of its third edition charm, so I may very well be on board. I'm going to be trying it out soon enough, and only then will I be completely sure if I'm upgrading. More on that, later.