After listening to the latest chapter of Viper Pilot (fantastic book btw) I think the term SEAD is a little bit dated... the old ARMs (AGM-45 Shrike and AGM-78 Standard ARM) were more for actual SEAD, but just SEAD is kind of a waste since they can just reactivate and be used later on, unless the SAM is then bombed. The newer ARMs (AGM-88D and E) are more of combined SEAD/DEAD weapons with their bigger warheads and multiple ways to track even if the enemy were to shut down their radar.
The AGM-88D that we are getting has GPS, so even if they shut down it should still destroy the SAM.