As to 'supposed social covenant', didn't Valve outright say that they would support L4D the way they did TF2? Not that the press is innocent when it comes to this; I remember from the reviews of L4D more or less went 'yeah, there are only a handful of maps, but this is Valve so you know they'll support it with updates like TF2'. I don't imagine we'll be seeing apologies or retractions in the media, will we?