The problem is that iPad and iPhone really took the mass market for gaming. But not for the better unfortunately. I'm sure it's more of an hype effect than real enjoyment on real games.
Said otherwise, I think everyone say they play downloadable games on iOS just because now it's the great thing to do, not because they actually have fun playing games on it. And I'll tell you more: many young males I saw during last months actually play less games overall then 5 years ago because they now spend more time on facebook than playing games.
I see on tram and buses many guys playing on iOS.....for less than 5 minutes. But they surf on facebook for hours. This also became a big factor and also explain why the gaming industry is down overall: the revenue coming from iOS are not even in the slightest enough to compensate the decreasing revenues coming from classic consoles and PC.
It's a paradigm shift, but the industry as a whole is damaged.
I wouldn't blame iOS gaming for that though. The fact is, casuals would rather look at Facebook than play games full stop. Even if smartphones didn't play games at all, they'd still be looking at Facebook on their commute rather than playing Uncharted on a Vita.