There's also entrenched franchises on consoles. Activision doesn't want to make Call of Duty for iPhone - $60 is a bit more enticing of a price point than $1. That's not to say they won't maybe make mobile versions in the future, but certainly not versions intended to replace the console versions (similar to how handhelds already have had CoD spinoffs). And that's just one example, of course.
I don't think you're necessarily wrong on where the market's going, long-term. But I think that it is a long term, at least ten years or more, until we see consumers saying "why would I buy an <Xbox Next> when I already have an iPhone and AirPlay?"
As for your second point, it's simply wrong to assume that all mobile games cost $1 and will continue to do so in the future. Part of the prevalence of $1 apps is because those apps are casual and very basic. There is no reason that higher-quality games can't charge more in the future. Final Fantasy Tactics (a PS/Game Boy Advanced/DS game) was released on the iPhone for $16. If and when smartphones rival consoles, there is nothing stopping Activision from charging $60.
And this isn't necessarily limited to smartphones. With much more powerful tablets, the trend towards mobile gaming replacing consoles will be even more accelerated than I described.
To believe that mobile is about to completely wipe out the gaming sector is simply deluded.
I'm very optimistic and excited about this, ever since I played several games hooked up to my tv using my Android.
Give me the ability to use the mobile as a console more than a touch screen haptic device (let me use my DS3) and ill give you 20$ for a good game.
(Betteridge's law of headlines: https://en.wikipedia.org/wiki/Betteridge%27s_law_of_headline...)
2013 aside, as someone who works at an mobile game startup, all of us believe that the future of video gaming truly is mobile.
Just think of this: within three years the iPhone and Android-phones will likely be more powerful than the Xbox360. Give another generation and they will likely be more powerful than the PS3. They already boast more features (geolocation, social integration). At that point, we may well be hooking up our smartphones to a larger screen to play our "console" games.