Something that a lot of people don't realize, and those commercials don't advertise, is that many stations are exempt from this. It only applies to full power stations, not low power stations and translators. And there are a lot of them. Many high power network stations going to digital may still continue to use their analog translator stations(repeaters)

So analog won't be completely dead. There's several in the St. Louis area. You can check your area here...
http://www.ntia.doc.gov/dtvcoupon/LPTVmap.html