I agree with that 100%, but there is already a HUGE Gov't contract company working on the fence, i believe the budget is some $2 Billion, i could be wrong on the exact money but i know its a substantial ammount of money.
Its not like their is going to be a whole Agency dedicated to Wire taps, all this really does is make them able to do it and not have to go to a DA for a warrant, or get some clearence to do so, they are just able to do it when they want. A warrant can be tedious to get, especially on wire taps.