I can't imagine there are any gaming companies serious about portable gaming who don't consider iOS their primary market. Hundreds of millions of customers who actually buy apps. You'd have to be dumb to ignore that.
In the same way, I expect that if the Apple TV does deliver on basically the same sort of disruption that the iPhone delivered to the mobile phone industry, we will see consoles becoming, perhaps not extinct, but at least fringe. Why buy any console, even a Wii, when your Apple TV already supports thousands of cool games?
Of course, this makes a large number of assumptions about the Apple TV. But I don't think they're that far-fetched (though Apple may choose to go in a completely different direction, of course). So, if a disruptive Apple TV comes out, with its sights set on the TV industry as the iPhone had its sights on the mobile phone industry, you can bet your ass that consoles will be a barely noticeable casualty of this battle (in the same way that cheap HD cams, point-and-shoots, and a wide variety of single-purpose devices are being wiped out by the iPhone without even being its target).
Apple gets convergence. Any tech gizmo industry where you have to buy one device for each piece of functionality you want is in deep shit the moment Apple makes a move in their neighbourhood. Consoles are one of those industries.
[1] http://venturebeat.com/2011/10/13/video-game-sales-drop-6-pe...
Surely Apple is capable of getting into this market, but that product doesn't look like anything they are working with now.
http://en.wikipedia.org/wiki/Nintendo_DS#System_sales_and_ma...