Dunn is a CORNERSTONE of the team. In every way. If by name only, he'll be the starter. And still get his carries.
Norwood is starting to pull a little LJ. He's playing so well, he's forcing them to give him more carries. On both game winning drives the last two weeks (OT/4th) Norwood was on the field.
So lets say he keeps playing so well, you simply can't keep him on the bench, they'll still do a Holmes/LJ with Dunn starting, and Norwood getting his cracks. But like Holmes, they won't sit Dunn. They just believe he brings so much to the team, they want him on the field.
So at best, it's a Holmes/LJ waiting for Dunn to get hurt type deal. 2008, who knows.