I think he has a solid future and could be a permanent fixture @ LG. He's better suited as a G and has the chance to be dominate there with proper coaching. Silatolu is not the answer and will be in the last year of his rookie contract next season. With Norwell, Kalil and Turner, the interior of our OL will be set for some time.
The thing about Silatolu is he wasn't playing that poorly when he tore his ACL last year. I wonder how much the injury affected him and if he might be better next year after another year of healing. Either way he's been terrible this year and should ride the bench the rest of the season.