I agree with Boatofcar. Will the Xbox be forgotten by video game enthusiasts like us? No, of course not.
However, I think ten years from now, GameCube games will be more sought after than Xbox games. The average John and Jane Doe teenagers and twenty-somethings who are interested in getting into classic gaming will be searching flea markets, Goodwill stores, and the internet for games like:
Baten Kaitos
Eternal Darkness
F-Zero GX
Killer 7
The Legend of Zelda: Wind Waker
Mario Power Tennis
Metroid Prime
Paper Mario
Pikmin
Resident Evil 4
Skies of Arcadia Legends
Star Fox Adventures
Star Wars Rogue Squadron II
Super Mario Sunshine
Super Monkey Ball
Super Smash Bros. Melee
Viewtiful Joe
Wave Race: Blue Storm
...all of which are on the GameCube.
Ten years from now, I don't think the average John and Jane Doe are going to search flea markets for Chronicles of Riddick, Gunvalkyrie, Crimson Skies, or RalliSport Challenge.
It's like how in the late 1990s, many people put down the N64 for being stupid and "kiddie," but now, people are looking for N64 games all the time. There's something about those types of games that magically strikes a chord with people ten years later.