I remember the days when boycots were very effective. Can we do that again?

They still are. Glenn Beck isn't on Fox anymore, right?

Is hurting them really the only option? Converting would be more useful..

Hurting is how you convert.

I expect them to act strictly in self-interest. Hurting them may be the only way to make it clear where that interest lies, but you're certainly right that other options are worth exploring if they can be found.