You finish one and three more pop up to take its place. The need for focus is becoming more and more critical. There is simply too much to deal with. If you are not focused, your time gets eaten away by all the thousands of details that make up life. If you are not highly focused, you're probably not getting anything accomplished.
Life never lets up.
And now, with computers and the Internet, the problem is worse by an order of magnitude. There is just so much information coming at you. Unless you make a concious effort to focus your attention, you'll be mired in meaningless data. Focus is what ties everything together, gives it a context, gives you something productive to do with it all. Without it, you'll be pulled in 15 different directions at once, and will never get anywhere.