I don't think 4 uPads was ever really expected. And I don't know how that price tag means only .01% of people are going to buy a second uPad. For what the thing does, that's a pretty reasonable price, and it's not like you'd have to buy more than just the one.
As for the 3DS thing, it won't work like a second uPad. FINE. It'll be more like the GBA/GC connectivity, but that is still a good thing. It still opens up room for new types of gameplay, and I can see Nintendo pushing it.