I can agree with this, Minecraft is being used as an example against this, but a good surge of traffic did occur when Valve promoted the game in one of their blog posts on Steam. Make of that what you will.
It wouldn't be impossible, but it'd be pretty damn hard for them to get the amount of attention they do otherwise. Cthulu Saves the World probably wouldn't exist on the PC format had it not had some decent exposure via XBLA's indie section(would've done far better had it just been in the arcade section though), and now that it's made it to Steam it has sold even better because of the front page coverage it got.
Then there is a whole other territory with app stores for mobile gaming. Angry Birds speaks for itself at this point.
It wouldn't be impossible, but it'd be pretty damn hard for them to get the amount of attention they do otherwise. Cthulu Saves the World probably wouldn't exist on the PC format had it not had some decent exposure via XBLA's indie section(would've done far better had it just been in the arcade section though), and now that it's made it to Steam it has sold even better because of the front page coverage it got.
Then there is a whole other territory with app stores for mobile gaming. Angry Birds speaks for itself at this point.