I'm one of those who would pay in order to buy some games. But I don't think the NFL is really looking to expand their revenues going that route, at least for now. If they were, we would have seen much more classic games released on DVD box sets. I think that at the moment, they are realizing that all the current games are being stream on the internet, on torrent site and rapidshare, and they are trying to respond to that. So they released a few 2009 games following the Super Bowl. They are hoping that people will pay instead of getting those games for free on the internet.
But the market for current games is limited. Even without those internet sites, the NFL has to ''compete'' against DVR and DVD recorder. Where they can make a few $ is with their library of older games. In the VCR days, nobody could get a pristine copy of a game like people can now with high definition, DVR and DVD recorders.
But that being said, to get back to the topic, I doubt that coaches films would generate much interest among fans. Really, who would want to sit thru 2 hours of game films all butchered up (all huddles edited out, the same play 3 times in a row from different angles, etc) with no sound, except if you are a coach yourself ?