They will easily last 10 years. If you plan on hording them longer than that, you should see mental help.
I think Nintendo will bring along the Virtual Console to their next console. If not, like other people mentioned, they would be screwing over a loyal fan base. It was a great addition to the Wii and definitely makes me a bit more excited about (possibly) getting one.
"My Pokemon brings all the nerds to the yard. And they're like, "You wanna trade cards?" Damn right, I wanna trade cards. I'll trade this, but not my Charizard."
XBOX 360, PlayStation 3 and Nintendo Wii owner.