Almost certainly correct. The change was implemented because the firewall between domestic and foreign surveillance was highlighted as one of the unforced error

Almost certainly correct. The change was implemented because the firewall between domestic and foreign surveillance was highlighted as one of the unforced errors in the 9/11 attacks succeeding, but this was the anticipated consequence of it. If you ask the average American whether they're comfortable with this tradeoff (added general scrutiny for added ability to prevent the next attempt at a 9/11), I don't know what they'd say.