As I've already said on twitter, this is stupid. The networks should be paying hulu, not us. Reason? I have started watching more network shows during primetime only because I got hooked on them previously through hulu. I have a feeling this is quite a common phenomenon.
I assume a lot of this happens, but the oposite for me. I now have no reason to tune in to the actual show on tv when I can watch it on demand. I like the flexibility of watching when I have time, or want to.
I assume it works out more in their favor (advertisement wise) vs say, recording it on your DVR and watching it later.