"Could rise again?"
Will rise again. IIRC only David Davis had the IT background to know this was BS. The next
sock puppet Right Honorable Home Secretary will regurgitate what the senior spookocrats and data fetishests tell them about "maintaining capability" and "diverse threats"
Note that even if a study by some outfit they trusted proved that searching for more terrorists by studying the comms pattern of known terrorists did not work this would still not stop the desire.
Remember catching terrorists is not the goal of this legislation.
Social control is.