New Super Mario Bros Wii should easily outsold Super Mario Galaxy in less than a year. As much as I like SMG, it is a gamer's game. Movement in complex 3D environment is not easy, especially with an unusual gravity field. Most casual gamers will be confused by the deep SMG gameplay and will not take the one hour needed to adapt to it. However, gameplay in NSMBW is easy enough to be immediately picked up and casuals will enjoy playing it.
I don't know if many people will buy the system for this game. I think buying a system for a specific game is a hardcore gamer thing. Still, it will improve the Wii's portfolio and help keep the sales' momentum.







