>If Apple can position the AppleTV as a console (maybe open it up to developers) or build something more along the lines of a traditional console, they will crush.
This opinion is pushed around a lot, however I cannot really see it happening, and I doubt Apple will ever pursue such a strategy.
For Apple to enter the console market, they would have to compete with the big boys, meaning if it can't push 100 million polygons at 1080p it will never get great adoption (who will want develop for a console with graphics out of 2005, and who will buy a console that doesn't have Call of Halo 7?). This means they have to create a modern console platform AND sell it at the price of an iPad. I'm not sure how the ghost of Jobs will take the news once he finds out Apple is selling hardware at a loss.
Next I doubt they would have anything to gain other than "you can now play CoD on the Apple ecosystem." They would lose money on the hardware, they wouldn't make much on the software if App Store profits mean anything (http://articles.businessinsider.com/2011-07-11/tech/29964545... reports they may have made ~$300 million). It just doesn't seem like a good idea finically. As far as the game console ecosystem goes I don't think MS/Sony/Nintendo will ever have to worry about Apple.
All in all, I am not really convinced that the App Store market will work for any of them. I strongly believe only Valve has the resources (and direction* ) to transition into the digital delivery era, at the expense of introducing yet another company into my living room. Still the question is how do you effectively deliver a magic box capable of playing Call of Duty at 1080p at the price of current consoles sustainably/profitably. Vavle's success so far doesn't worry about hardware. Their customers are either willing to spend $1000+ on a gaming every couple years, or just suck it up and blame Dell/HP for why their laptop can't play CoD.
* If Sony got their shit together, you are right, I believe they would take over the living room. They almost did it with PS2, and if the PS2 had come a bit later, or the PS3 was able to sell as much they might have done it. I think Sony could have built an Apple level brand loyalty (in the sense of having a Sony Computer, Phone, Laptop, Console) and (if they got much better at software development), they could have built a Sony store to manage your content on all those devices (after all they already own most of the movies and music). In another universe Sony may have been a Google + Hardware.