Yes the curve will change with contraction, leading to replacement players still being in MLB, but the curve will change for the better, and the new replacement level players will be more talented then the current replacement level players. Look at it this way, with thirty teams, the league demands 30 starting quality Short stops, 150 starting pitchers, etc. As well as some depth to fill out benches. With 28 teams the league will demand two less of every starter. Take away the 2 worst starting first baseman, the ten worst starting pitchers in a rotation and throw them on a bench somewhere, you don't think the quality of play would improve?