I don't think there's a way to replace Stabler. The most I could hope for is to come and try and develop a character who is interesting, who is interesting to me, who is interesting to fans and who could contribute to the storytelling that is 'Law & Order: SVU. '
First and foremost, you have to make the movie for yourself. And that's not to say, to hell with everyone else, but what else have you got to go on but your own taste and judgment?