Well the Dolphins will at least have a balanced offense now instead of running Ricky into a brick wall 30x a game.
Having a bad running game certainly doesn't disqualify you from having a good passing game. By good passing game I mean one that translates into big fantasy numbers for one WR.
If David Boston hadn't come to town, I'd feel pretty confident thinking Chambers could go for 1100 & 6. However, Boston is good enough to take significant looks away from Chambers.
If Miami wants to win games this year, they probably will have to evolve from a power rushing attack a west coast style offense team like the Bucs, Patriots or Raiders. That leads me to believe that neither WR will be a world beater, but both will be solid in spot duty. That also leads me to think Fiedler would be better suited for the role since his skill set looks more West Coast Offense than Air Coryell.