Wade makes a good point. I think a lot of coaches adjust to a degree; for instance, last season the run game changed when the Bills went back to more power focused runs. That worked for what the line did better and Shady being a system defying player it worked. I think a lot of coaches adjust plays, schemes, but there's only so much they can do.
they want to play a certain way and will keep bringing in players who can execute their vision. Players who they find cannot will be weeded out.