Eventually, you would reach a new equilibrium. So B is equal to 4 molar. And then C, D, and E would go up. The position of equilibrium therefore moves to the left. However, if we have a mixture of reactants and products that have not yet reached equilibrium, the changes necessary to reach equilibrium may not be so obvious.
To be practical, an industrial process must give a large yield of product relatively quickly. If I have a container-- nope, too shocking. About 2 billion pounds are manufactured in the United States each year.