This is a very good point actually. Would Nintendo be willing to include a standard type, dual thumbstick controller as a pack-in with every system? Will they also include a Wii-mote like wand with every single system?
I think it's safe to assume that while the Wii was WILDLY successful because of the newness of the Wii-mote gimmick, they have to know that some of their games would play much better with a standard dual-thumbstick controller. But there no denying that adding one into every system they make will add a cost to the overall package that could take a bit away from the tech side.
I don't think there is any chance that Nintendo comes in at more than $299.99. They won't go above $299.99, I just can't see it. So, if $299.99 was the price, and you have to bundle two controllers in the box, then that is going to cut into the technological ambitions a bit. Still, regardless, the huge bump in ram will be significant.
But yeah, you make a good point. All 3 companies really need to pack both controllers into the box. The 32X, Sega CD and N64 Expansion pack have proved that add-on's, while initially quite interesting, just don't work in the long run. Developers want to sell to the entire console base, not a fraction-offed portion of it.