It's hardly surprising that industry is moving to protect an exploitative business model from the threat of new technology. Broadcast TV is free because of commercials; we pay for the content by watching their product pitches. When someone uses Aereo, they are still subjected to commercials, and are therefore still paying for the content. The extra $8 to Aereo is for the service of putting my paid content in a more convenient place....phone, tablet, etc.
The fact that cable companies were able to get their customers to pay twice for content doesn't mean that the practice merits exclusivity.