Yep. I absolutely agree. Games have only started to explore 'alternate' monetization schemes. DLC was on my mind as I was writing my comment. In one sense DLC makes games more like serialized television rather than the (supposedly) complete and self contained experience of a movie. Alternately DLC is an opportunity to deepen the experience of players, something that movies and television cant really do.
Keep in mind: With the advent of online services like GoG, Steam, PS Plus, and XBLA, this is very quickly changing.