It's rather hard to call what will happen, but I think that the Wii has a more-than-even chance of surpassing the DS in the long run. The reason for this is simple enough: the DS, while a Blue Ocean product, is not disruptive. The market did not reshape itself when the DS emerged, and it took disruptive software made for the DS (Nintendogs, Brain Age, et. al.) to cause it to have a large-scale effect.
The Wii, on the other hand, is inherently disruptive as well as Blue Ocean. Historically, disruptive products which change markets far outstrip even their next-best competition by miles (just see how the horse-drawn buggy market faded once the Model T took off). That alone gives it an edge which Nintendo is trying to artificially inject into the DS by association (the DS and Wii, Nintendo's tag team to victory!). If that strategy is effective, then it's a true toss-up as to which will be on top in the end.
Either way, Nintendo wins...
Sky Render - Sanity is for the weak.
