I assume games we'll see fpses tack on multipayer 'light-gun' modes in addition to more traditional, nunchaku-enabled modes.
Does this split the userbase? Yeah. It's hard for me to say how this will impact things....on the one hand, requiring multiple controllers already splits the userbase. Also, it seems reasonable to assume most serious gamers will have the requisite controllers. On the other hand, the ps's multi-tap stupidity did seem to limit the amount of people who played 4-player games.