This rule really is a relic of a bygone era. From Radio Online...
The Order finds that the Commission's sports blackout rules are no longer justified in light of the significant changes in the sports industry since these rules were first adopted nearly forty years ago. At that time, ticket sales were the primary source of revenue for the NFL and most NFL games failed to sell out. Today, television revenues have replaced ticket sales as the NFL's main source of revenue, and blackouts of NFL games are increasingly rare. The NFL is the most profitable sports league in the country, with $6 billion in television revenue per year, and only two games were blacked out last season.