Well, the main thing it terms of sales for the wii atleast is that it will apeal in all 3 target locations. Europe, Japan, and the U.S. The ps3 may have some trouble with Europe due to the delay and the lawsuits with lik-sang(which i for one to still not understand) and besides these new Blue Dragon bundles the 360 looks as if it will die in Japan. But the wii will be in all 3 places right away.
Also, when it comes the those people that havn't played zelda in 20 years, well they can now with the virtual console. I personally missed the nes, as my first console was the snes, so i will be all over those.
Plus, im not sure if someone stated this earlier or not but with the 360 getting a ps1 exclusive on xboxlivearcade earlier in the year there is a chance that if the wii even takes in early lead (which is really a guarentee with such a heavy outnumbering of consoles compared to the ps3) many developers of those games may really want them shipped over to the dream cast to make some nice cash. So, i could see the ps1, n64, every sega system and such all shipped to the virtual console during its life time. Nintendo could find a way of getting every console ever, excluding last-gen, on the wii. So, let's watch wii domination
So, for me anyway, there is no way the wii goes the way of the dreamcast