Did you see my name there as one of the comment people? They don't believe that arc fault breakers will increase the cost of new house building by a lot of money. Yet in this tight economical times, you just have to wonder.
Wait, in a couple of years it will be a code that everyone in the house will have to have personal GFI receptacles on the hip. ( In case you use a non GFI receptacle in a house.)Everyone will have to have miners caps with lights, so that you don't walk in the dark or bump your head. Plus you will need personal air bags in case you fall down. This way you won't get hurt!