Yes, we would all love to blame amps and electronics for the rainouts. I don't know about Naperville, but Omaha and Minneapolis were both canceled more due to lightning and a tornado threat than just rain. That is something that SHOULD cancel a show, electronics or not. I have also seen shows canceled or changed to a standstill due to wet field conditions. Part of that is probably due to the evolution of the visual part of the activity (faster, tighter drill) than equipment changes.
I do agree that in our litigation-happy society, there is the real possibility that one lawsuit and a corps is done. I would have loved for last night's show to go on, but I didn't want anyone hurt.