Yes, open wireless everywhere would be beneficial from a practical sense. Let me call attention to something amazing: this is a call for voluntary participation rather than begging for a government edict enforced at the end of a gun. And Comcast immediately responded by temporarily opening their xfinity network.
Communication is critical in time of crisis, and the Internet allows for the most effective way of getting information in and out. With readily available networks, government officials could use tools like Twitter to quickly spread information, citizen reports could help focus assistance where it is needed most, and social media updates could help reassure friends and loved ones—keeping mobile phone lines open for emergencies.