It would be a smart move for him to branch out into films (but then again, whoever said Justin was smart?). He has got to realize the popularity and adulation of boy idols has a relatively short life (despite the attempts of many boybands of late to try to hang on with reunions and such). Elvis and Justin Timberlake come to mind as examples of singing idols who have gotten into films. Of course Elvis and Justin Timberlake had/have real talent
The real question is whether the additional ticket sales to the movie by a bunch of kids would offset the loss of ticket sales by those that abhor this kid and think it would be the wrong choice for the character.