American public is grossly ignorant of its own history, and on may important issues Beck is the only source of essential information (that should've been provided in high schools). In contrast, O'Riley is a populist. As talented as he is, there has always been enough populists around. He is replaceable in that sense, but Beck is not.
Most people, including many on this forum, don't know what socialism and fascism are, and can't recognize them when fascism looks them in the face. Had more conservatives known the basics that Beck is trying to provide, we would see less socialist propaganda on FR.
Seems like you are blaming one person that provides enlightenment where it is desperately lacking.
Beck has got a lot of people reading books and learning the history of this great nation...