Yes, because PS3 and XBOX wireless controllers are $10 each, right?
Player 1's controller is $0 with the purchase of a console. Additional controllers are needed only for same-screen multiplayer, and Slashdot regulars such as CronoCloud have long maintained that same-screen is most useful to children, who have already become a minority in the market, and is dying out in favor of online. Besides, I've found it a lot easier to find used controllers for consoles than for phones. I bought the Xbox 360 wired controller that I use for PC gaming at this pawn shop.
I'd rather pay $60 for a game controller and $3 for each game [and] I'd be surprised if the majority of people (casual gamers) won't feel the same way, especially with portable games improving so much in quality.
I was under the impression that casual gamers expected handheld games to be in point-and-click genres, like Cut the Rope, Angry Birds, Fruit Ninja, Bejeweled, and the like. On consoles, conventional wisdom is that games requiring a specialized accessory (like Guitar Hero, DDR, and Wii Fit) have tended to sell well only when bundled with that accessory.
Let me rephrase it a different way: If you were to find an Android game on Google Play that could not be played to completion with just the on-screen gamepad, how many people do you think would ignore the "Controller strongly recommended" in the description, buy it, and give a one-star rating that it's too hard?
One could develop an Android-exclusive application that requires a gamepad [for the] forthcoming Ouya game console
All the android gamepads cost around that same price.
I wasn't singling out iPhone vs. Android as much as iPhone vs. 3DS/Vita. The Ouya console includes one controller. And even if you limit it to phones and tablets, if you happen to own an Xbox 360 controller or any HID controllers for the PC, those work with an Android 4 device through a $2 USB OTG cable.