You clearly have no understanding of why Hulu exists at all. Even the people who created Hulu (NBC, Fox, ABC) hates the very idea of it. Getting a viewer to watch a show on television is much much more profitable. They were forced to create a website in hopes it would lessen torrent downloads.
Most people only download torrents at home. Any device you can take outside the home (including laptops) does not help them.
For example: I'm at home. I want to watch last week's episode of 24. If Hulu didn't exist, I would just download a torrent. Instead of watching no commercials, I watch 2 minutes of commercials. Better than nothing so Hulu saved them some money. But if I watched it on TV, I would've watched 18 minutes of commercials.
Now, say I'm at the coffee shop on my laptop/iPad/iPhone/other mobile device with my 3G connection. I'm less likely to download a torrent in public so having Hulu available saves them nothing. Having your shows available outside your home also makes it MORE convenient than television and they will lose television viewers.
If everyone stops watching TV and switches to Hulu, your favorite shows wouldn't exist because there is very little revenue there compared to live TV ads.