"and a later demonstration that they are inneffective in the WoT "
Can you substanciate this statement with facts?
That partial quote is part of the conjecture offered immediately after - it has not happened to date in the US - but if and when an attack occurs in spite of the Patriot Act, and all the other measures implemented, a vast number of people will join the already large number of malcontents in calling for an end (Give the Terrorist what they want and they will leave us alone).