[ja2ke]

I don't think the unique input methods brought on by a multitouch glass display has limited the desirability to game developers... 3-4 years ago that could have been a concern, but the huge iOS games market has shown that to not be the case. We're getting unique, tremendously well-selling experiences on touch/mobile devices with great regularity. Major publishers and indies are churning out games for these devices, all without a keyboard, mouse, or controller required to play.

It's true that you can't play every genre of game on an iPad, but it's also been true for years that not every genre of PC game would play well on a mainline TV console (traditional adventure games, strategy games, and anything with a lot of diverse/unique user input or complex underlying systems tends to fail on a 360 controller/living room couch situation), and not every GameBoy/DS game would work well there either.

That aside, personally as a gamer I'm glad that there are game systems out there with nearly mutually exclusive input methods, because it prevents lazy ports, and lazy ports generally, basically, suck to play.