No, the terrorists win when they succeed in killing innocent civilians and bringing down the government they were targeting. Forcing us to go through very annoying security measures is a loss for us but does not count as a terrorist "win".
No. All terrorism is about changing behavior. Terrorists want you to either start doing something or want you to stop doing something. Killing, maiming or treats of killing or maiming are means to that end.
Most terrorism is about keeping the funds flowing for the guy sending the other guys off to blow themselves (and/or any bystanders who happen to be in the vicinity) to smithereens.
The IRA wanted a united island of Ireland, for example. They didn't think they'd "won" because rubbish bins were removed from stations. Complaining that the terrorists are "winning" because the TSA makes us take off our shoes at airports or our civil liberties have eroded somewhat is to miss the point completely.