The Internet won't die. Internet sites will die. AT&T's 3G network will certainly die.
For instance, on 9/11, CNN had to drop to a text only site. They survived that way when their graphical version died like a slashdotted site. But, on 9/11, sites unrelated to news were still readily available. Amazon was still up, TV Guide was up, Travelocity was up.
Yes, the bureaucrats at GAO are 1d10ts. They need to crawl back into their hole. This sounds like some document pre-written by AT&T.