It'll change the way your eyes interpret technology. Tech's biggest tool in their work to wrangle the masses is appeal, and color sits at the center of appeal.
By enabling any form of greyscale, especially on your phones, you take this ability away from them.
You will only be attracted to information rather than be distracted by an over saturated or engineered image made of colors.
You declaw them by doing this. Eventually you realize that the Internet is fucking stupid, and since reality looks more appealing than your grey, rightfully lifeless brick, you'll probably even go outside more.
What do you think of this glorious solution to technology's massive role in our lives?