I've been talking with some friends recently about how sixth-gen and up games generally won't retain their value due to having a high amount of prints. There are some PS2/GC/XBox games that will always prove to be expensive, but what PS3/Wii/360 games do you guys think might end up being pricey 5-10 years down the line?
I've noticed that most of the first-party Wii games have retained 30-50% of their value, and I've found that to be somewhat interesting. If Xenoblade, Pandora's Tower, and The Last Story end up being PAL-only games (localization wise) I can imagine them commanding high prices for some time, also.
I think most of the 360-exclusive disc-based shmups will probably always go for a lot as well. As for multi-plat and/or exclusive PS3/360 games, I'm guessing that the Japan-only PS3 version of Red Seeds Profile will always sell for a high price. I would also wager that if Atlus never picked up Demon's Souls, the Hong Kong version (100% English) would forever sell at a high price point as well.
Any other thoughts on this issue? Along with PS3/Wii/360, I would say that handhelds count too.