I think you are seriously mistaken if you think that gamers are going to steer away from the Wii due to it being aimed at non-gamers.
Coming from an older gamer who remembers playing the original NES, the Wii is taking us back to our roots. This console looks fun, and that is something that has not happened in the last 2 generations of game systems. The XBox 360 and Playstation 3 are very pretty machines, but they are nothing more than a rehash of previously released systems with a little more eye candy, and that is not what everyone wants.
The fact that I can't remember the last game to really draw me in yet there are alsready more than half a dozen titles for the Wii that have me excited.
It is hard to convince everybody, but the simple truth is and always will be:
GAMEPLAY > GRAPHICS
The proof is looking at consoles of old. Games on the NES/SNES looked like crap by todays standards, but they were addicting. I remember playing Kid Icarus for months and months on end. The Zelda games, Mario games, and a thousand other titles. They kept you playing for weeks/months, not like these new games that come out and offer 10 hours of gameplay.
I honestly believe that Nintendo are on the right track here. I believe the reason they are focusing on non gamers, is that the gamers are going to be hooked on the Wii without them trying.