I think it's possible but highly improbable. Hell, being right 99% of the time ain't that bad. I still love the guy.
The Wii did change EVERYTHING and create a new market.
Hell, I could buy Wii games for the rest of my life. They could release a new Wii 2 with new features but still support the Wii 1. In fact, I think that's what will happen. Just like the NES, SNES, PS1, and PS2. I don't think the upgrade will be iPod style though. I think Wii 1 games will keep being made long after the Wii 2 comes out. Hell, crazies are still making Dreamcast games, aren't they? In that sense, the Wii will last forever.