I guess it could be a possibility that consoles might decline. Haha, all those probability-words.
But I think the things we think of when we think of PC gaming is Steam and indie games and great, wonderful, promising, unique forays into the realms of brilliance.
The things that most casual gamers think of are things like Facebook games, Zynga stuff, and P2P browser MMOs. And they make up quite a lucrative market.
So I'd say yes, the PC gaming market is definitely rising, but it might not all be in the way you're thinking of.
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Anecdote time!
I chatted with a friend lately about games, and through the course of the conversation I realized how separate our gaming world views were. When I asked if he played strategy games, he brought up a browser-based Facebook game he'd been playing, and noted how fun it was and how into strategy games he was.
It was a little disconcerting in the next week, when this article on CNN came up, entitled "Who Says Social Games are Shallow?".
http://www.cnn.com/2011/TECH/gaming.gadgets/07/19/social.games.deeper/index.htmlA few lines from there you might enjoy:
Tossing out the tired heavy metal riffs, alpha-male attitude and endless explosions, social games embrace all comers and steadily reward, not punish, players as they progress. This completely turns the traditional game design model on its head.
Today's popular social games are training entire generations of game players that "Mafia Wars" is a strategy game, "MMA Pro Fighter" a sports title and "Ravenwood Fair" a simulation. Consider how that clashes with most current software publishers' definitions and how they'll be forced to adapt to respond to the expectations of this ever-growing audience.
These games are truly changing the scope, definition and perception of what video games can be, ripping up the playbook and throwing it out the hand-drawn, pastel-colored window.
Sometimes it's like a splash of cold water to see how differently the majority of people view videogames, as compared with forumgoers on a place like B12G or other annals of the internet.