Travel Dates and Names

Airlines today want the full name of all people on every flight, plus the date of birth on the ticket. They say that it will decrease time in the security lines, and will not make it as confusing to mistake a terrorist for a innocent person. "It will be drastic" and the numbers will fall and the time waiting in long lines.
Ok, thats great, but dont you already have to show an ID or drivers license to get on board? Its already in effect, so why would the time in lines change, and there is also a picture on the license so why confuse people? How will this cut back on risk and time?
http://www.cnn.com/2005/TRAVEL/05/04/passenger.screening.ap/index.html