I agree we need to get control of our borders, North and South...although how anyone is going to seal our Eastern and Western borders are beyond me...it's extremely easy to pilot a small boat into any part of the east coast. But I think these concerns about privacy are entirely overblown.
Do you ahve any idea how huge one day's database would be, let alone several years? I think your web history and e-mail privacy is secure unless you're plotting to kill the Pres. or blow up embassies. In that case I hope there's a sysytem in place to uncover those messages and track the sender and recipient.