There are many forms of government. State, Local, Federal. Other than when FEMA gets involved in disasters, information to the public is the responsibility of the local emergency services and governors offices. Local are the ones on the ground making the calls. If they don't train and drill their folks on the purpose and how to activate EAS, then it doesn't matter how many radio stations there are with EAS if no alerts are being generated locally.
Consumers aren't going to carry around multiple devices just in case something might happen. Given all that smartphones provide, its silly to think that modern media consumers are going to consider portable radios on a day to day basis.
The reality is, given the increase in terrestrial noise, AM stations can't be picked up 100 miles away anymore, and certainly not on some keychain radio with an internal antenna. Can't cheat the laws of physics. And radio stations are only able to help if they receive information from authorities. In this day and age that means alerts to phones and social media come first, not activating EAS nor reaching out to local radio stations because they already know that's not where people are paying attention.
That's said here many times, but one could argue there are just as many examples where disasters occurred and cell/PCS was up and running, even at a limited level. In essence, radio being involved would not have helped the situation because largely the public isn't paying attention to radio as a source of news anymore.