Savvy move by Valve
This is a savvy move by Valve in my opinion.
Steam (behind the Appstore, Google Play, and Amazon) is arguably one of the largest game delivery platforms out there. Bringing other content product types into their offerings pushes them towards being a company like iTunes, and away from one like GameFly or NetFlix. There is room in the marketplace for more of these multi-product-type marketplaces.
But Valve's experience with multiplayer gives them a unique position to leverage more from temporal media (TV/Film) then perhaps these other competitors.
This is a topic I could rattle on aboot alll daay. I know the DP of Motivational Growth, will have to wish him congrats. And it's about time I try to get my games on Steam. Motivational Growth is an apt description for the future of this move by Valve.