Smallville has been on TV going on its 8th season...TV shows don't run that long w/o some serious viewers kicking in on it...The same general moviegoers that went to see Superman Returns (remember, there hadn't been a Superman movie in decades) would go see this, only this time, they'll have 22 Episodes of Smallville leading up to it...Wiki says Smallville had its lowest turnout of the shows inception, and that's still 3.7 million viewers...One wouldn't help but to think that there are lots of people that used to watch the show that would be curious enough about a Smallville movie to see it in theaters...
Seems like I was one of those folk until I watched it...Everyone I've turned onto, even my Mom, who knows shit about comics or Superman movies, is hooked on it, and she's almost 50...A Smallville movie to cap the TV show would probably be bigger than most people think...people who aint seen the shit have too many negatory preconceptions of the show.