Even the worst primetime television shows have on ABC, CBS, NBC and Fox get millions of viewers. If the network can convert a couple percentage points of viewers into downloaders, it can turn into decent money. 2 bucks a pop. 50k downloads per eps. Thats more money than a hit reality show like Survivor earns in syndication.
He also suggests that this revenue stream will make up for the loss of revenue as TiVo owners block out commercials and drive down the cost of advertising.