I think for some people with slower connections it would be good to have access to a seperate wav file, it's not always necessary to see the video anyway. The wav file would be a lot smaller and a good alternative for dial-up users, especially since some videos don't have a lot of visual content besides the people in the interview.
I've downloaded a couple of GBs of videos anyway, and I can't complain about the 1.5MB/s transfer rate.