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I think OuroborosCobra already said what I was going to, really. The EBS has been able to co-opt your local signals for tests for decades now... this is just the exact same thing nationally. What's the big deal? Especially since it only covers TV and radio, as the official site itself notes. It's literally not even physically possible to co-opt the internet for such a signal to begin with. (Cell phones I honestly have no idea about.)
The only downside is that damn nightmare-inducing test message they always use. OK, granted, I guess it makes sense for an emergency signal to be nightmare-inducing, but your heart sinks into your chest every time you hear that droning, loud, brown-note-pitched BOOOOOOOOOOOOOOOOP noise going on.
I would think I'd be ticked off even more by there being an emergency big enough to warrant a national alert that I wasn't informed about. Plus you can always go back to talking to your doctor again after the three minutes are up. Assuming they even can/do ever spread the EAS to cell phones. Or that they even use voice; it might be transmitted via a voicemail or text message instead.
Um. Pretty sure the doctor is going to understand that he should wait through a freakin' emergency message rather than dumping his patient in the middle of it. Not only that, but the doctor is going to want to listen to the message for his own benefit as well, since he's doubly going to have to worry about whatever issues the crisis is bringing (for his own sake and the sake of his patients).