I think that for the past 100 years the line has been in stone, and Manfred has decided to move it to sand. Sand, by its nature, is a great medium in which to draw a line, because you can always wash it away and redraw it in a different place. MLB could have left it in stone if they wished. They didn't. I have no doubt the line will continue to move, no matter how thick and how dark it is currently.