You are probably right, but then again, how long ago was planes deliberately flying into tall buildings a non issue.
Considering how cheaply this could be done and how resourced terrorist are these days, all it needs is one of them to think of it and then pay off an electrcal engineer somewhere and ....
If they can learn to fly 767's and they already train to make bombs etc you never know whats next.

This thread could also lead into some more useful ideas about power protection and lightning protection which would be the first place to start to protect against an EMP.